The proof principle that you are describing is known as induction. Induction is a method of proof that is used to establish that a property holds for all natural numbers (or, more generally, for all elements of a well-ordered set).
The basic idea behind induction is as follows:
First, you start with a base case, which is a specific natural number (usually 0 or 1) for which you can directly prove that the property holds.
Next, you assume that the property holds for some natural number n. This is known as the induction hypothesis.
Using the induction hypothesis, you then prove that the property also holds for the natural number n+1. This is known as the induction step.
Since you have already established that the property holds for the base case, and you have shown that if it holds for one natural number, it must also hold for the next natural number, it follows that the property holds for all natural numbers.
Induction is a very powerful proof technique and is used extensively in mathematics to prove theorems about the properties of natural numbers and other well-ordered sets.
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based off of this information, what conclusions can be made about the mean value theorem? this contradicts the mean value theorem since f satisfies the hypotheses on the given interval but there does not exist any c on (1, 4) such that f '(c)
The correct option is; 4: this contradicts the Mean Value Theorem since there exists a c on (1, 7) such that f '(c) = f(7) − f(1) (7 − 1) , but f is not continuous at x = 3.
Explain the term Mean Value Theorem?The Mean Value Theorem says that there occurs a point c in the interval (a,b) so that f'(c) equals the function's average rate of change throughout [a,b] if a function f is continuous just on closed interval [a,b] as well as differentiable just on open interval (a,b).The function being used is;
f(x) = (x - 3)⁻²
If we separate this function according to x, we obtain;
f'(x) = -2/(x - 3)³
Finding all c values f(7) − f(1) = f '(c)(7 − 1).is our goal.
This suggests that;
0.06 - 0.25 = -2/(c - 3)³ x 6
-0.19 = -12/(c - 3)³
(c - 3)³ = 63.157
c = 6.98
If the Mean Value Theorem holds for this function, then f must be continuous on [1,7] and differentiable on (1,7).
But when x = 3, f is not continuous, hence the Mean Value Theorem's prediction is false.
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The complete question is-
Let f(x) = (x − 3)−2. Find all values of c in (1, 7) such that f(7) − f(1) = f '(c)(7 − 1). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) c = Based off of this information, what conclusions can be made about the Mean Value Theorem?
This contradicts the Mean Value Theorem since f satisfies the hypotheses on the given interval but there does not exist any c on (1, 7) such that f '(c) = f(7) − f(1) 7 − 1 . This does not contradict the Mean Value Theorem since f is not continuous at x = 3. This does not contradict the Mean Value Theorem since f is continuous on (1, 7), and there exists a c on (1, 7) such that f '(c) = f(7) − f(1) 7 − 1 . This contradicts the Mean Value Theorem since there exists a c on (1, 7) such that f '(c) = f(7) − f(1) 7 − 1 , but f is not continuous at x = 3. Nothing can be concluded.25. (06.04 MC)
The function f(x)=2x²+3 represents the rate of a boat traveling with the current in miles per hour. The function g(x)=x+ 2 represents the time the boat traveled in hours. Solve (f- g)(2), and interpret the answer. (1 point)
O(-a)(2)-15, the distance in miles the boat traveled
O(t-g)(2)-15, the number of boats
O(-a)(2)-44, the distance in miles the boat traveled
O (f-g)(2)-44, the number of boats
The value of the function given as (f . g)(2) is D. (f.g)(2) = 44, the number of boats
How to explain the function?It's important to note that functions are the expressions that are separated by an equal sign. It should be noted that that they've dependent as well as independent variables.
In this case, the function f(x)=2x²+3 represents the rate of a boat traveling with the current in miles per hour and the function g(x)=x+ 2 represents the time the boat traveled in hours. This will be illustrated as:
f(x) = 2x² + 3.
g(x) = x + 2
Therefore, we will evaluate the product
(f . g)(x) = (2x² + 3(x + 2)
(f . g)(x) = (2 × 2² + 3)(2 + 2)
(f . g)(2) = 44
The correct option is D.
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Look below for images I will give brainliest whoever gets its right! There are 5 trigonometry problems.
The measures of the angles and the values of the trigonometric functions are as follows;
33 (e) The angle is (450 - π)°
34 (f) The reference angle is 75°
40 (e) cos(θ) = -8/9
43 (e) sin(θ) = √3/2
What are trigonometric functions?The trigonometric functions provides the relationships between an angle and the three sides of a right triangle.
33 (e) The measure of the angle from the curve of the angle mark is found as follows;
The angle turned = 360 + (90 - θ)
Where; θ = π
Angle = 360° + (90 - π)° = (450 - π)°
34 (f) The reference angle is smallest (acute) angle made by the terminal side and the x-axis.
From the diagram, the reference angle is 360° - 285° = 75°
40 (e) The angle is in the Quadrant III
cos(θ) in Quadrant III is -cos(φ), where;
φ = θ - 180
From the diagram, cos(φ) = 8/√((-8)² + 17)
cos(θ) = -8/(√((-8)² + 17)) = -8/9
40 (f) The angle is in Quadrant II
sin(θ) = sin(φ), where; φ = 180 - θ
Therefore;
sin(φ) = 5/√((-3)² + 5²) = 5/√(34)
sin(θ) = sin(φ) = 5/√(34)
43 (e) sin(120°) = sin(180° - 120°) = sin(60°) = √3/2
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find the product of the monomial and the polynomial
4x ^ 3 * y ^ 3 * (3x ^ 3 - 7x * y ^ 2 + 2xy - y)
The product of the monomial and the polynomial given is 12x⁶y³-28x⁴y⁵+8x⁴y⁴-4x³y⁴
What is polynomial?A polynomial is defined as an expression which is composed of variables, constants and exponents, that are combined using mathematical operations.
Given that, a polynomial and a monomial 4x³y³ and (3x³-7xy²+2xy-y)
To find the product of the monomial and the polynomial, we will multiply them,
4x³y³×(3x³-7xy²+2xy-y)
= 12x⁶y³-28x⁴y⁵+8x⁴y⁴-4x³y⁴
Hence, The product of the monomial and the polynomial given is 12x⁶y³-28x⁴y⁵+8x⁴y⁴-4x³y⁴
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suppose the correlation matrix for three variables (v1, v2, and v3) is as seen here. what would be the best conclusion regarding the relationships between the variables?
the three vectors are linearly dependent and they cant generate a 3 dimensional vector subspace.
Lets take v1 = (1,0,0), v2 = (1,1,0) and v3 = (0,1,0). Neither of the vectors are a multiple of the other, however they dont generate R³ because for example the vector (0,0,1) is not a linear combination of v1, v2 and v3.
Not that, despite not being a multiple of v1 or v3, v2 is a linear combination of v1 and v3, because it is the sum of both of them. Therefore, the three vectors are linearly dependent and they cant generate a 3 dimensional vector subspace.
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A vertical number line is given.
A vertical number line starting at negative 9 with tick marks every one-half unit up to 2. The value negative 5.5 is labeled.
The change in the value of a stock was plotted on a number line in the image. If 0 represents the original cost, which of the following is true about the plotted value?
The stock is −5.5 less than the original value, and the absolute value is 5.5.
The stock is 5.5 less than the original value, and the absolute value is 5.5.
The stock is −5.5 greater than the original value, and the absolute value is 5.5.
The stock is 5.5 greater than the original value, and the absolute value is 5.5.
Answer:
b) The stock is 5.5 less than the original value, and the absolute value is 5.5.
Step-by-step explanation:
First of all, let's make our number line. The question says you need it to start at -9, so we can assume that it will go until 10. It also wants us to make half-tick marks. (There is an image attached of the number line.)
It says that -5.5 is labeled, so do that on your number line.
Next, it explains that 0 is the original price. 0 is where the stock is starting at. This does not mean that the value of the stock is 0!!! (It means that NO MATTER what the price of the stock is, that is now considered 0.)
Now for the multiple choice, here's why all the answers are incorrect/correct.
a) If something is -5.5 less, it's the same as subtracting a negative number- which makes it positive!! SO this would mean that it added value.
b) Correct! Since it value is lower by 5.5, it's 5.5 less than the og value.
c) Since it's -5.5 greater, that's like adding a negative number: it's the same as subtracting. I suppose this is technically correct, but it's weird.
d) This one says's it's 5.5 greater, which is totally wrong. The value is decreasing, not increasing!
All of them say the absolute value is 5.5. This is correct. Absolute value is the distance from 0, and -5.5 is 5.5 units away from 0. (put simply, absolute value is just making the number positive.
hopefully this makes sense and helps you!!
A knife is three times the cost of a spoon.
9 spoons and 12 knives cost £82.80
Work out the cost of 1 knife
Answer: 1 knife costes £5.52
Step-by-step explanation:
Let a knife costes £x and a spoon costes £y
Hence, we obtain a system of equations:
x=3y (1)
12x+9y=82.80 (2)
Divide both parts of the equation (2) by 3:
x=3y
4x+3y=27.6 (3)
We substitute the value of x=3u into equation (3):
4(3y)+3y=27.6
12y+3y=27.6
15y=27.6
Divide both parts of the equation by 15:
y=£1.84
x=3y
x=3(1.84)
x=£5.52
find an equation of the tangent line to the graph of f(x) = xe^−x at its inflection point.
Answer:
y = (4 -x)e^-2
Step-by-step explanation:
You want an equation of the tangent line to the graph of f(x) = xe^−x at its inflection point.
Inflection pointThe inflection point on a curve is the point where the second derivative is zero, where the curve changes from being concave downward to concave upward, or vice versa.
We can use the product rule to differentiate f(x):
(uv)' = u'v +uv'
f'(x) = 1·e^-x +x·(-1)(e^-x) = (e^-x)(1 -x)
Then the second derivative is ...
f''(x) = (-e^-x)(1 -x) +(e^-x)(-1) = (e^-x)(x -2)
The second derivative is zero where one of its factors is zero. e^-x is never zero, so we have ...
(x -2) = 0 ⇒ x = 2
The point of inflection occurs at x = 2.
Point-slope equationThe point-slope equation of the line with slope m through point (h, k) is ...
y -k = m(x -h)
For this problem, we have ...
m = f'(2) = (e^-2)(1 -(2)) = -e^-2
(h, k) = (2, f(2)) = (2, 2e^-2)
So, the equation of the tangent line is ...
y -2e^-2 = -e^-2(x -2)
In slope-intercept form, this is ...
y = (-e^-2)x +4e^-2
__
Additional comment
We can rearrange the equation to ...
y = (4 -x)e^-2
Usually a tangent line touches the graph, but does not cross it. The tangent at the point of inflection necessarily crosses the graph.
Aha wa not feeling well. She went to the doctor. The doctor aid her body temperature i 3 degree
more than the normal body temperature. He gave medicine which bought her body temperature
6 degree le than the current body temperature and 3 degree le than the normal body temperature. Find her current temperature:
Using logical reasoning, we know that Aha's current body temperature after taking the medicine is 34°C.
What is logical reasoning?Deductive reasoning, often known as logical reasoning, is the process of drawing conclusions from a body of facts or evidence.
It involves putting specific premises in front of conclusions.
Induction and abduction are two additional categories of logical reasoning that are typically distinguished in addition to the formal deduction.
If one has a premise or precondition, a conclusion or logical consequence, and a rule or material conditional that signals the conclusion given the premise, one can explain the following.
So, we know that:
The normal body temperature of the body is 37°C.
Aha current body temperature is 3 more than normal body temperature, then it is: 37 + 3 = 40°C (Current body temperature)
After taking medicine,
Temperature is 6° less than current body temperature, that is:
40 - 6 = 34°C
Temperature is 3° less than the normal body temperature, that is:
37 - 3 = 34°C
Then, the current temperature after taking medicine: 34°C
Therefore, using logical reasoning, we know that Aha's current body temperature after taking the medicine is 34°C.
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Simplify
Enter the answer that belongs in the green box for the numerator of the exponent
Answer:
[tex]x {}^{ \frac{19}{15} } [/tex]
Step-by-step explanation:
Hope that's helps
An airplane has stopped to re-fuel. Fuel is being added to the airplane's tanks at a constant rate. After 13 minutes, the airplane has 32,882 gallons of fuel. After 31 minutes, the airplane has 34,902.5 gallons of fuel. Write a function in f(t) form that describes the amount of fuel in the plane at time t.
The function in f(t) form that describes the amount of fuel in the plane at time t will be;
⇒ f (t) = 112.25t + 31.425.75
What is Equation of line?The equation of line in point-slope form passing through the points
(x₁ , y₁) and (x₂, y₂) with slope m is defined as;
⇒ y - y₁ = m (x - x₁)
Where, m = (y₂ - y₁) / (x₂ - x₁)
Given that;
After 13 minutes, the airplane has 32,882 gallons of fuel. After 31 minutes, the airplane has 34,902.5 gallons of fuel.
Now,
Since, After 13 minutes, the airplane has 32,882 gallons of fuel. After 31 minutes, the airplane has 34,902.5 gallons of fuel.
Hence, The equation of line passes through the points (13, 32882) and (31, 34902.5)
So, We need to find the slope of the line.
Hence, Slope of the line is,
m = (y₂ - y₁) / (x₂ - x₁)
m = (32882 - 34902.5) / ((31 - 13)
m = 2020.5 / 18
m = 112.25
Thus, The equation of line with slope 112.25 is,
⇒ y - 32885 = 112.25 (x - 13)
⇒ y - 32885 = 112.25x - 1459.25
⇒ y = 112.25x - 1459.25 + 32885
⇒ y = 112.25x + 31.425.75
Therefore, The function in f(t) form that describes the amount of fuel in the plane at time t will be;
⇒ f (t) = 112.25t + 31.425.75
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When implified, the expreion (x Supercript one-eighth Baeline) (x Supercript three-eighth Baleline) i 12. Which i a poible value of x?
The excretion Superscript one-eighth Beeline is
[tex]\left(x^{\frac{1}{8}}\right)\left(x^{\frac{3}{8}}\right)=12[/tex]
What is exponential identity?
An example of an exponential function is the growth of bacteria. Some bacteria double every hour. If you start with 1 bacterium and it doubles every hour, you will have 2x bacteria after x hours. This can be written as f(x) = 2x.
To find, the possible value of x = ?
[tex]\begin{aligned}& \therefore\left(x^{\frac{1}{8}}\right)\left(x^{\frac{3}{8}}\right)=12 \\& \Rightarrow x^{\frac{1}{8}}+\frac{3}{8}=12\end{aligned}[/tex]
Using the exponential identity
,[tex]\begin{aligned}& a^m a^n=a^{m+n} \\& \Rightarrow x^{\frac{1+3}{8}}=12 \\& \Rightarrow x^{\frac{4}{8}}=12 \\& \Rightarrow x^{\frac{1}{2}}=12\end{aligned}[/tex]
Squaring both sides, we get
[tex]\begin{aligned}& \left(x^{\frac{1}{2}}\right)^2=(12)^2 \\& \Rightarrow x^{\frac{1}{2} \times 2}=144 \\& \Rightarrow x=144\end{aligned}\therefore The possible value of x=144[/tex]
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need help me and thank you
Answer:
t=180-2x46=88 degrees
u=1/2(180-114)=33 degrees
if a lawyer charges 120 an hour(or any fraction of an hour) how much is a mill for 3 hours and 20 minutes?
If a lawyer charges 120 an hour then the bill for 3 hours and 20 minutes will be 400
Bill: A bill is the printed or written statement of the money owed for goods or services.In later Latin, bulla became billa, and in English billa became bill. The word can still refer to various official documents, such as a proposed law that is brought before parliament, although it is now most commonly used for documents that request payment of money.
One hour = 60 minutes
3 hours and 20 minutes = 3×60 +20
= 180+20=200
Here, one hour=60 minutes charges 120
1 minute charges = 120/60
= 2
200 minute charges = 2×200=400
Therefore If a lawyer charges 120 an hour then the bill for 3 hours and 20 minutes will be 400.
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What equation represents this sentence. 5 less than a number is 12.
0 5-n=12
0 5 n-12
0 5 12-n
O n-5=12
the lengths of pregnancies in a small rural village are normally distributed with a mean of 260 days and a standard deviation of 15 days. in what range would you expect to find the middle 50% of most pregnancies? between and .
The range is ( 290, 230).
In statistics, the standard deviation is a measure of the amount of variation. The low standard deviation indicates that the values tend to be close to the expected value of the set, while a high standard deviation indicates that the values are spread out over a wide range.
According to the question,
The middle 50% of the pregnancies are within two standard deviations of the mean: 260 ± 2*15
= ( 260 + 2*15 , 260 - 2*15)
= ( 260 + 30, 260-30)
= ( 290, 230)
Hence the range is ( 290, 230).
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(x³ - 16x² + 51x + 63) ÷ (x − 6)
Answer:
x^2-10x-9+9/x-6
quotient:x^2-10x-9
remainder:9
Step-by-step explanation:
10. Solve the system of
inequalities. (Note: you may need to
adjust your scale on the coordinate plane.)
-7x+3y ≤ 15
6x - 5y<12
The Corner Points are (-6.529, -10.235), (0, -2.4), (2, 0), (-2.143, 0), (0, 5)
What is Linear Inequality?
A linear inequality is a mathematical inequality that incorporates a linear function. A linear inequality contains one of the inequality symbols. It displays data that is not equal in graph form.
Solution:
Please refer to the Graph
So, we plotted the graph using the basic point method in which we found two point of the equation to draw a straight line.
And once we drawn the lines for the Inequalities we shaded the respective region
The Corner Points are (-6.529, -10.235), (0, -2.4), (2, 0), (-2.143, 0), (0, 5)
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I'm tuck on thi quetion
A 2-gallon container of diinfectant cot $23. 76. What i the price per quart?
The price per quart of disinfectant is = $2.97
According to the information given in the question,
Quantity of the container of the disinfectants = 2 gallon
The price of a 2-gallon container of disinfectants = is $23.76
The concept used in this question is Ratio and Proportion,
The ratio is defined as the representation of two numbers in a fraction but in the case of ratio and proportion two numbers are separated by using a sign = ":"
Let us assume two numbers a and b,
If we have to present these two numbers in fractions = [tex]\frac{a}{b}[/tex].
If we have to present these two numbers in ratios = a : b.
According to the given question,
A 2-gallon container of disinfectants costs = $23.76
1 gallon = 4 quarts
So if 2 gallons = $23.762
= 2 gallons = 2 x 4
= 8 quarts
So, 8 quarts = $23.76
Now we will be dividing both sides by 8,
⇒ 1 quart = [tex]\frac{23.76}{8}[/tex]
⇒ 1 quart = $2.97
Therefore, the price per quart of disinfectant is = $2.97
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Need help Asap for 25 points
What is the solution to this inequality?
14x−5<−6
Responses
x<4
x less than 4
x<−4
x less than negative 4
x>4
x greater than 4
x>−4
Answer:
Your answer is B
Step-by-step explanation:
[tex]\frac{1}{4}x-5 < -6\\\\\frac{1}{4}x < -1 \\\\[/tex]
Multiply 4 to both sides leaving x by itself.
x < -4
Remember when you divide or multiply a negative to solve for x you switch the signs of greater than to less than or vice versa.
Find the equation, in standard form, of the line passing through the points (3,-4) and (5,1).
A. 5x-2y=23
B. y=5/2x-23/2
c. 2x-3y=9
D. 5x+2y= 23
Only answers A, C, and D are in standard form, so we can rule B out immediately.
If you throw (5,1) into A, you get:
5(5) - 2(1) = 23
25 - 2 = 23
This checks, so A *might* be the answer.
If you throw (5,1) into C, you get:
2(5)-3(1) = 9
10 - 3 ≠ 9
This doesn't check, so it's not C.
If you throw (5,1) into D, you get:
5(5)+2(1) = 23
25 + 2 ≠ 23
This doesn't check, so it's not D.
The only standard form equation that (5,1) is a solution for is A.
Your answer is A.
when a confidence interval for the difference of two population means contains 0, what can be concluded?
a. an error was made in the calculation
b. the results of the confidence interval are inclonclusive
c. the population means are significantly different
d. the population means the same
The population means may be the same
So, option D is correct.
What is meant by confidence interval?
In statistics, the probability that a population parameter will fall between a set of values a predefined percentage of the time is known as the confidence interval. Analysts typically use confidence intervals that cover 95% or 99% of the expected observations while assessing data. In frequentist statistics, an estimation range for an unknown parameter is referred to as a confidence interval. The most common confidence level for computing confidence intervals is 95%, however other levels, such 90% or 99%, are also occasionally employed. The conclusion is reached that the result is statistically significant if the confidence interval eliminates the value of zero effect.
If (μ₁- μ₂=0) is included in the confidence interval, that means this two means have the same difference that is zero.
Therefore, they may be nearly same,
So, The population means may be the same
Hence, option D is correct.
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the figure above shows the graph of f the derivative of the function f the domain of f is the set
Since the function increases; stops; and decreases x= -2 has to be a maximum. Similarly, x=0 is a minimum and x=2 is an inflection point. (They are "relative" max/mins as opposed to absolute.
"Critical Points" (maximums, minimum and inflection points) occur when the first derivative of the function is zero. Here f(x) is neither increasing nor decreasing at that exact point. When f '(x) is positive, f(x) is increasing; when f '(x)is negative f(x) is decreasing. In this case, the critical points are x= -2, 0, 2. For x<-2 the derivative is positive so the function is increasing, for x>-2 the derivative is negative so the function is decreasing.
b) When f '(x) is positive, f(x) is increasing; when f '(x) is negative f(x) is decreasing. In this case, the critical points are x= -2, 0, 2. For x<-2 the derivative is positive so the function is increasing, for x>-2 the derivative is negative so the function is decreasing.
Concavity is determined by the second derivative, which is easy to sketch from the first. Where f '(x) is decreasing, f ''(x)is negative; where f '(x) is increasing f ''(x) is positive. Where f '(x) is zero, f ''(x) has critical points. Now from this graph, where f ''(x) is positive, f(x) is concave up, where f ''(x)is negative, f(x) is concave down. I get that f(x) is concave up on(-1,1) and (2,3).
c) Now it should be easy to graph f from the maxs mins and critical points. There is my attempt.
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Find the measure of each angle indicated
A. 125 degrees
B. 55 degrees
Help!!!
Answer:
125
Step-by-step explanation:
alternate interior
Josie is moving to a new apartment. The cost of her
rent is $850 per month, and her landlord charges a
deposit of $1000.
a) Write a linear function to represent the total cost, C,
or renting the apartment for m months.
b) What will be the total cost of renting the apartment for one year?
Answer:
b
Step-by-step explanation:
Can anyone help me with this please???????
Answer:$785
Step-by-step explanation:
since she took money out already you have to add the to the pre existing total.
PLS answer il give brainliest
The length, b, of the longest side of the triangle is 13.17 cm
Calculating the length of a side of a triangleFrom the question, we are to determine the length, b, of the longest side of the triangle
From the given information,
Area of the triangle = 22.4 cm²
Then, we can write that
22.4 = 1/2 × a × 3.7 sin97
44.8 = a × 3.7 sin97
44.8 = a × 3.6724
a = 44.8/3.6724
a = 12.199
a = 12.2
Given that the sides of the triangle are a, b, and c,
Then,
From the law of cosines, we can write that
b² = c² + a² - 2ac cosB
b² = 3.7² + a² - 2×a×3.7 cos97°
b² = 3.7² + 12.2² - 2×12.2×3.7 cos97°
b² = 3.7² + 12.2² - 2×12.2×3.7 cos97°
b² = 173.53
b = √173.53
b = 13.17 cm
The length of b is 13.17 cm
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find the measures of the numbered angles.
The difference between the meaure of two comlementary angle i 14. Find the meaure of both angle
The measure of the first angle is 70° and the measure of the second angle is 100°.
The measure of complementary angles is the sum of their angles equal to 180°. Thus, if one angle has a measure of 70°, then the other angle must have a measure of 180° - 70° = 110°. Since the difference between the two angles is 14°, the first angle must have a measure of 70°, and the second angle must have a measure of 100°. This is because if the first angle has a measure of 70°, then the second angle must have a measure of 110°. Since the difference between the two angles is 14°, the second angle must have a measure of 100° in order to meet this difference. Therefore, the measure of the first angle is 70° and the measure of the second angle is 100°.
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Find the x and y intercepts
4x - 5y = 40
Answer:
x-intercept is (10,0)
y-intercept is (0, -8)
Step-by-step explanation:
Our equation is 4x - 5y = 40
Let's find x-intercepts first
X-intercepts is when the y = 0
So we put 0 in for the y, and we have the equation
4x =40
x =10
So our x-intercept located at (10,0)
Now find the y-intercepts
Y-intercepts is when the x = 10
So we put 0 in for the x, and we have the equation
-5y = 40
y= -8
So our y-intercept is located at (0,-8)
Answer:
Step-by-step explanation:
Y-int: (0, -8)
X-Int: (10, 0)
To find the y and x intercepts you have to plug in the 0 for the variable. You'd get 4(0)-5y=40 you get this by plugging in the 0 for x and then you solve. 4 x 0 is 0 so you'd get -5y=40 divide -5 on both sides and get y=-8 meaning that is the y-intercept.
You'd do the same when you look for the x-int. Just that you'd plug in a 0 for y instead of x. Which is 4x-5(0)=40. -5 x 0 is 0. So you'd have 4x=40 divide both sides by 4 and you'd get x=10 meaning that is the x intercept.
Remember that when looking for the y- intercept there should always be a zero in front meaning the x-value, and when looking for the x-intercept there should always be a zero in the back meaning the y-value.
(Hopefully you were able to understand how I got the x and y intercepts for this equation)