What is the solution of x^2-x-3/4=0?

-1/4
1/2
3/2
3/4

The probability that the average height of 9 randomly chosen people is over 70 inches is approximately 0.0478, or 4.78%.

1. Identify the given values: mean (µ) = 68 inches, standard deviation (σ) = 3 inches, and sample size (n) = 9.

2. Calculate the standard deviation of the sample mean using the formula σ/√n: 3/√9 = 3/3 = 1.

3. Determine the z-score for 70 inches using the formula (X - µ)/(σ/√n): (70 - 68)/1 = 2.

4. Find the probability of a z-score greater than 2 by referring to a z-table or using a calculator, which is approximately 0.0228.

5. Since the question asks for the probability over 70 inches, subtract the probability from 1: 1 - 0.0228 ≈ 0.9772.

6. The probability that the average height is over 70 inches is 1 - 0.9772 = 0.0478, or 4.78%.

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The area inside the quadrilateral with corners (1, 2), (2, 3), (5, 1), and (3, -1) is approximately 4.5 square units.


1. Sketch the quadrilateral with given vertices.

2. Divide the quadrilateral into three triangles:

  - Triangle 1: (1, 2), (2, 3), (3, -1)
  - Triangle 2: (1, 2), (3, -1), (5, 1)
  - Triangle 3: (2, 3), (3, -1), (5, 1)

3. For each triangle, find the equation of the line connecting its two points on the same vertical level (either x=1, x=3, or x=5).

4. Calculate the definite integral of each line equation over its respective x range.

5. Subtract the lower line's integral from the upper line's integral for each triangle to find each triangle's area.

6. Add the areas of the three triangles to find the total area of the quadrilateral.

Following these steps, the quadrilateral's area is approximately 4.5 square units.

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The sum of the sequence 3, 6, 9, 12, ⋯ 300 is 15150, which was obtained using the formula for the sum of an arithmetic sequence.

To find the sum of the given sequence, we first need to identify the first term, the common difference, and the number of terms (n).

Here, a = 3 (the first term), d = 3 (the common difference), and we need to find n.

We can use the formula for the nth term of an arithmetic sequence to find n

a + (n - 1)d = 300

3 + (n - 1)3 = 300

3n - 3 = 297

3n = 300

n = 100

So, there are 100 terms in the sequence.

To find the sum of the sequence, we can use the formula for the sum of an arithmetic sequence

Sn = n/2(2a + (n-1)d)

Plugging in the values we get,

S100 = 100/2(2(3) + (100-1)3)

S100 = 50(6 + 297)

S100 = 15150

Therefore, the sum of the given sequence is 15150.

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The sum of the sequence 3, 6, 9, 12, ⋯ 300 is 15150, which was obtained using the formula for the sum of an arithmetic sequence.

To find the sum of the given sequence, we first need to identify the first term, the common difference, and the number of terms (n).

Here, a = 3 (the first term), d = 3 (the common difference), and we need to find n.

We can use the formula for the nth term of an arithmetic sequence to find n

a + (n - 1)d = 300

3 + (n - 1)3 = 300

3n - 3 = 297

3n = 300

n = 100

So, there are 100 terms in the sequence.

To find the sum of the sequence, we can use the formula for the sum of an arithmetic sequence

Sn = n/2(2a + (n-1)d)

Plugging in the values we get,

S100 = 100/2(2(3) + (100-1)3)

S100 = 50(6 + 297)

S100 = 15150

Therefore, the sum of the given sequence is 15150.

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The given statement, "The matrix a and its transpose, ar, have different sets of eigenvalues" is False.

The proof for this is that if λ is an eigenvalue of A with corresponding eigenvector x, then we have Ax = λx.

Taking the transpose of both sides, we get x^T A^T = λx^T. Since x^T is a row vector and A^T is a square matrix, we can see that λ is also an eigenvalue of A^T with the corresponding eigenvector x^T. Therefore, A and A^T have the same set of eigenvalues.

This characteristic is significant in many linear algebra applications because it allows us to simplify eigenvalue computations by dealing with the transpose of a matrix, which can be easier to manage in some circumstances. It also offers a valuable link between a matrix's eigenvalues and those of its transpose, which may be used in certain arguments and methods.

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a. Numerical form of f(3): When x=3, the denominator of the function becomes 3-3=0, which makes the function undefined. Therefore, f(3) does not exist. This is known as a "point of discontinuity."

b. Graph of f(x): To plot the graph of f, we need to find the values of f(x) for different values of x. We can use algebraic techniques to simplify the function:

f(x) = (4x^2-17x+15)/(x-3)

= (4x-3)(x-5)/(x-3) (factoring the numerator)

= 4x - 3 (canceling out the common factor of (x-3))

Now, we can see that the function is undefined at x=3, but for all other values of x, it is equal to 4x-3. Therefore, the graph of f(x) is a straight line with slope 4 and y-intercept -3, except for a hole at x=3. To sketch the graph, we can draw a dotted line at x=3 to indicate the point of discontinuity, and draw the straight line with a break at x=3,

c. Limit of f(x) as x approaches 3:

As x approaches 3, the denominator of the function gets closer and closer to zero, but the numerator also approaches a specific value. We can use algebraic techniques to evaluate the limit:

lim x→3 (4x^2-17x+15)/(x-3)

= lim x→3 [(4x-3)(x-5)/(x-3)] (factoring the numerator)

= lim x→3 (4x-3) (canceling out the common factor of (x-3))

= 7

Therefore, the limit of f(x) as x approaches 3 is 7.

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To declare three private double instance variables x, y, and radius in a class representing a circle, you would include the following code within your class definition:
```java
private double x;
private double y;
private double radius;
```

To declare three private double instance variables x, y, and radius in a class, you can use the following code:

```
private double x;
private double y;
private double radius;
```

Here, the `private` keyword makes sure that these variables are accessible only within the class and not outside it. The `double` data type is used to store decimal values. The variables `x` and `y` represent the coordinates of the center of the circle, while `radius` represents the radius of the circle. It is important to note that no other instance variables other than these three should be declared, as per the instructions given in the question.

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The measure of missing angles are:

<BAT = 40 degree

<AOC = 40

<ADC = 49

As, the angle between a chord and a tangent through one of the end points of the chord is equal to the angle in the alternate segment

So, <BAT = 40 degree

Now, The Angle at circumference are half of the angle at the Centre  

So, <AOC = 2 <BAT

<AOC = 2 (20)

<AOC = 40

We know sum of opposite angle of cyclic quadrilateral is 180

So, <ADC + <ABC = 180

<ADC = 180 - 131

<ADC = 49

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The correct answers are Using fast modular exponentiation, we can compute a^m mod b in order of log(n) steps, The lcm of two distinct prime numbers is their product, The Euclidean algorithm always terminates because the remainders are integers, get smaller with each step, and are bounded below by 0, You can block convert a binary number to octal by grouping the binary digits into blocks of 3 and converting each block into an octal digit and If p and q are distinct primes, then the lcm of p and q and pq^2 is pq. The correct answers options are  B, D, F, G, and H.

Option B is true because fast modular exponentiation is a technique that can be used to compute a^m mod b in O(log n) time complexity. Option D is true because the LCM of two distinct prime numbers is their product since they do not have any common factors other than 1.

Option F is true because the Euclidean algorithm is guaranteed to terminate because each remainder is smaller than the divisor in each step, and the remainders are non-negative integers. Option G is true because binary numbers can be grouped into blocks of 3 digits, and each block can be converted into a single octal digit.

Option H is true because the LCM of p and q and pq^2 is pq since the prime factors of pq^2 are already included in the prime factorization of pq. So, Statements that are true are B, D, F, G, and H.

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For a population with an original σ=5, the standard error of the mean (SEM) for a sample size of n=4 is approximately 2.5 points, for a sample size of n=9 it is approximately 1.67 points, and for a sample size of n=16 it is approximately 1.25 points.

In question 9, with a population σ of 10, the SEM for a sample size of n=4 is approximately 5 points, for a sample size of n=9 it is approximately 3.33 points, and for a sample size of n=16 it is approximately 2.5 points. The difference between the SEM in questions 8 and 9 is due to the difference in population σ. A larger population σ will result in a larger SEM, which means more error is expected in the sample mean.

Increasing sample size (comparing a, b, c) will decrease the SEM, resulting in less error expected in the sample mean. This is because as sample size increases, the sample mean becomes a better representation of the population mean.

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Step-by-step explanation:

The equation x^3 + y^3 + z^3 = k is a three-variable equation known as a cubic equation. To solve for one variable in terms of the other two, we need additional information or constraints on the values of the variables. Without any constraints, we can still make some observations about the equation.

For example, when k = 0, the equation becomes x^3 + y^3 + z^3 = 0, which is known as the Fermat's Last Theorem. The theorem states that there are no positive integer solutions to this equation for n > 2. In other words, there are no three positive integers x, y, and z such that x^n + y^n = z^n for n > 2.

If we assume that k is a nonzero constant, we can rewrite the equation as:

z^3 = k - x^3 - y^3

This shows that z is a function of x and y, and we can plot the function as a surface in three dimensions. The shape of the surface depends on the value of k, and it can be smooth or have sharp edges and corners.

Without more information or constraints, it is not possible to find the exact values of x, y, and z that satisfy the equation. However, we can use numerical methods or approximations to find approximate solutions for specific values of k.

Answer:

w=28

Step-by-step explanation:

since w=4r, and r is equal to 7, we plug 7 into the equation, getting w=4x7, which is 28.

The margin of error for the duration of telephone calls directed by a local telephone company is approximately 0.511 minutes or 30.66 seconds, with a 98% confidence level.

Given the provided information, we can use the following terms to calculate the margin of error:

1. Standard deviation (s) = 4.5 minutes
2. Sample size (n) = 420 calls
3. Confidence level = 98%

First, let's find the critical value (z-score) for a 98% confidence level. Using a standard normal distribution table, we can determine that the critical value is approximately 2.33.

Next, we need to find the standard error. The standard error (SE) is calculated as follows:

SE = s / √n
SE = 4.5 / √420
SE ≈ 0.2195

Now that we have the critical value and standard error, we can calculate the margin of error (ME) using the formula:

ME = z-score * SE
ME = 2.33 * 0.2195
ME ≈ 0.511

Thus, the margin of error for the duration of telephone calls directed by a local telephone company is approximately 0.511 minutes or 30.66 seconds, with a 98% confidence level. This means that the true mean duration of telephone calls is likely to be within 0.511 minutes (or 30.66 seconds) of the sample mean.

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The equivalence classes are, [0]={0,3,-3,6,-6}, [1]={1,4,-2,-5}, [2]={2,5,-1,-4}, [3]={3,6,-3,0}, and R has 4 distinct equivalence classes: {[0]}, {[1], [4], [-2], [-5]}, {[2], [5], [-1], [-4]}, and {[3], [6], [-3], [0]}.

An equivalence relation is a mathematical concept that relates objects or elements in a set based on a certain property or characteristic they share. In this case, the relation R on set A relates elements x and y if their difference is divisible by 3. This means that the elements in each equivalence class of R share this same property.

The set-roster notation expresses the equivalence classes of R as sets of elements in A that are related to each other under R. In this case, there are four distinct equivalence classes of R, each containing elements that differ by multiples of 3. This concept is important in various areas of mathematics, including algebra, topology, and geometry.

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Correct option about "How would the correlation most likely be affected?" is C. Become weaker negative

If the price of meat ($3.00 per pound) is removed, the correlation between price per pound and grams of fat is likely to become weaker negative.

This is because the price per pound is a factor that influences the amount of fat in meat - typically, cheaper cuts of meat have more fat. Therefore, when this factor is removed, the relationship between price and fat grams may not be as strong.

When meat with $3.00 per pound is removed from the dataset, the correlation will most likely:

C. Become weaker negative

This is because removing data points can affect the overall trend observed in the scatterplot. When a data point with a strong influence on the negative correlation is removed, the remaining data points may show a weaker negative correlation.

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The statement "the standard errors should not always be included along with the estimated coefficients" is false.

False

Therefore, if the standard error is not included, it would not be possible to construct the confidence interval.

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Simplified answers, including any radicals.

1. The length of u x v

|u x v| = 8√(17)

2. Direction of u x v

u x v = (2/√(17))i + (8/√(17))j + (9/√(17))k
3. Length of v x u

|v x u| = 8√(17)

4. The direction of v x u

v x u = (2/√(17))i + (9/√(17))j - (8/√(17))k

5. u x v x v times u is equal to 0.

To find u x v, we can use the formula:
u x v = |i j k|
|9 -2 -8|
|8  0 -8|

Expanding the determinant, we get:
u x v = (16)i + (64)j + (72)k

To find the length of u x v, we can use the formula:
|u x v| = √((16)² + (64)² + (72)²) = 8√(17)

To find the direction of u x v, we can normalize the vector by dividing it by its length:
u x v = (2/√(17))i + (8/√(17))j + (9/√(17))k

Now, to find v x u, we can use the formula:
v x u = |i j k|
|8  0 -8|
|9 -2 -8|

Expanding the determinant, we get:
v x u = (16)i + (72)j - (64)k

To find the length of v x u, we can use the formula:
|v x u| = √((16)² + (72)² + (-64)²) = 8√(17)

To find the direction of v x u, we can normalize the vector by dividing it by its length:
v x u = (2/√(17))i + (9/√(17))j - (8/√(17))k

Now, we need to find u x v x v times u. First, we need to find u x v x v:
u x v x v = u x (v x v) = u x 0 = 0

Therefore, u x v x v times u is equal to 0.

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The unit rate of a proportional relationship is the constant of proportion, representing by how much the output variable is added/subtracted when the input variable is added by one.

A proportional relationship is a type of relationship between two quantities in which they maintain a constant ratio to each other.

The equation that defines the proportional relationship is given as follows:

y = kx.

In which k is the constant of proportionality, also called unit rate, representing the increase in the output variable y when the constant variable x is increased by one.

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By Cavalieri's Principle, the volume of that slanted cylinder will be the same volume of a non-slanted cylinder with the same altitude.

so we have a cylinder with a radius of 3 and a height of 7 and a cone hitching a ride on it, with a radius of 3 and a height of 3, so let's simply get the volume of each.

[tex]\textit{volume of a cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ h=7\\ r=3 \end{cases}\implies V=\pi (3)^2(7) \\\\[-0.35em] ~\dotfill\\\\ \textit{volume of a cone}\\\\ V=\cfrac{\pi r^2 h}{3}~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ h=3\\ r=3 \end{cases}\implies V=\cfrac{\pi (3)^2(3)}{3} \\\\[-0.35em] ~\dotfill\\\\ \pi (3)^2(7)~~ + ~~\cfrac{\pi (3)^2(3)}{3}\implies 63\pi +9\pi \implies 72\pi ~~ \approx ~~ \text{\LARGE 226.19}~in^3[/tex]

Answer:

It's 84

Step-by-step explanation:

To calculate the area of a triangule you need to use this formula:

B * H / 2

So:

12 * 14 / 2 = 84

Hope this helps :)

Pls brainliest...

The estimated regression functions for the four regions using the first-order regression model (1.1) are appropriate.

a. To estimate the regression functions, the first-order regression model (1.1) is used for each region. This model assumes a linear relationship between the predictor variable and the response variable. The estimated regression functions are obtained by fitting a straight line to the data points in each region that best represents the relationship between the predictor and response variables.

b. The estimated regression functions may or may not be similar for the four regions. This depends on the data and the specific characteristics of each region. The estimated regression functions will differ in terms of the slope and intercept values, which represent the magnitude and direction of the relationship between the predictor and response variables.

c. To calculate the mean squared error (MSE) for each region, the residuals (the differences between the observed response values and the predicted response values from the estimated regression functions) are squared and averaged. MSE is a measure of the variability around the fitted regression line, with a lower value indicating less variability.

d. If the MSE values are similar for the four regions, it indicates that the variability around the fitted regression line is approximately the same across all regions. If the MSE values are different, it suggests that the variability around the fitted regression line varies across the regions.

Therefore, the estimated regression functions are appropriate for each region using the first-order regression model (1.1). The similarity of the estimated regression functions and the variability around the fitted regression line can be determined by calculating the MSE values for each region and comparing them.

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The length of the curve r = 4θ², 0≤θ≤2√3, is 38.786 units.

To find the length of the curve, we can use the formula for arc length:
[tex]L = \int_{a}^{b}\sqrt{(1 + (dy/dx)^2)} dx[/tex]

In this case, we have the polar equation r = 4θ², which we can convert to Cartesian coordinates using x = r cos(θ) and y = r sin(θ):

x = 4θ² cos(θ)
y = 4θ² sin(θ)

To find dy/dx, we can use the chain rule:

dy/dx = (dy/dθ)/(dx/dθ)

= (4θ² cos(θ) + 8θ sin(θ))/(8θ cos(θ) - 4θ² sin(θ))

Simplifying this expression, we get:

dy/dx =(4θ) (θ cos(θ) + 2 sin(θ))/(2 cos(θ) - θ sin(θ))

Now we can substitute this expression and the expression for x into the arc length formula:
[tex]L = \int_{0}^{2\sqrt{3}}\sqrt{(1 + ((4\theta)(\theta cos(\theta) + 2sin(\theta))/(2cos(\theta) - \theta sin(\theta)))^2)} d\theta[/tex]

This integral is difficult to solve analytically, so we can use numerical methods to approximate the value. Using a calculator or computer program, we get:

L ≈ 38.786

So the length of the curve is approximately 38.786 units.

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It is possible for a data set to have a more specific distribution, such as a normal distribution, which allows for a more accurate estimate of the percentage of data within certain standard deviations of the mean.

False.

Chebyshev's Theorem states that for any set of data, regardless of its distribution, at least 1-1/k^2 of the data will be within k standard deviations of the mean, where k is any positive integer greater than 1. In other words, at least 75% of the data will be within 2 standard deviations of the mean, not 95%.

For example, if we have a data set with a mean of 50 and a standard deviation of 10, Chebyshev's Theorem tells us that at least 75% of the data will be within 20 units of the mean (i.e. between 30 and 70). However, it is possible for a data set to have a more specific distribution, such as a normal distribution, which allows for a more accurate estimate of the percentage of data within certain standard deviations of the mean.

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It is possible for a data set to have a more specific distribution, such as a normal distribution, which allows for a more accurate estimate of the percentage of data within certain standard deviations of the mean.

False.

Chebyshev's Theorem states that for any set of data, regardless of its distribution, at least 1-1/k^2 of the data will be within k standard deviations of the mean, where k is any positive integer greater than 1. In other words, at least 75% of the data will be within 2 standard deviations of the mean, not 95%.

For example, if we have a data set with a mean of 50 and a standard deviation of 10, Chebyshev's Theorem tells us that at least 75% of the data will be within 20 units of the mean (i.e. between 30 and 70). However, it is possible for a data set to have a more specific distribution, such as a normal distribution, which allows for a more accurate estimate of the percentage of data within certain standard deviations of the mean.

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Answer: The probability of the spinner landing on yellow is 6/10 or 3/5, which can also be expressed as 0.6 or 60%.

y''(0) = 2.

To find y''(0) for the given function y=7x^4+x^3+x^2+cx+, we need to take the second derivative of the function and then evaluate it at x=0.

First, we find the second derivative of y:

y'(x) = 28x^3 + 3x^2 + 2x + c

y''(x) = 84x^2 + 6x + 2

Now, we evaluate y''(x) at x=0:

y''(0) = 84(0)^2 + 6(0) + 2

y''(0) = 2

Therefore, y''(0) = 2.

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The cone diameter is 2√6 m.

To find the diameter, we must use the height and volume of a cone to find diameter and then multiply the volume of the cone by 3 and divide the resultant number by pi times the height.

The formula for the vol. of a cone is V = (1/3)(area of base)(height).

20π = 1/3π(r)^2(10)

20π*3/10π = r2

√60π/10π = r

Using our calculator, we will get 2√3.

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The required answer is the series ∑ln(6k)4k diverges.

determine whether the series ∑ln(6k)4k converges or diverges.

To analyze the convergence or divergence of the given series, we can use the Ratio Test:

1. Find the ratio of consecutive terms: a_(k+1)/ask
  In this case, a_k = ln(6k)4k.

2. Compute the limit as k approaches infinity: lim(k->∞) (a_(k+1)/a_k)
  a_(k+1) = ln(6(k+1))4(k+1) and a_k = ln(6k)4k

3. Compute the ratio: (ln(6(k+1))4(k+1))/(ln(6k)4k)

4. Find the limit as k approaches infinity: lim(k->∞) [(ln(6(k+1))4(k+1))/(ln(6k)4k)]

5. Apply L'Hopital's rule for indeterminate forms (0/0 or ∞/∞) if needed.

If limit exist and partial sum converges or individual term approaches zero then series is convergent otherwise divergent and further checked by methods explained below.
In this case, however, we notice that the terms in the series do not go to zero, since ln(6k)4k will always grow larger as k increases. This implies that the series does not converge.

Thus, the series ∑ln(6k)4k diverges.

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Step-by-step explanation:

f(x)=3x+5

3*6+5=23

f(0)=3*0+5=5

f(1)=3*1+5=8

Okay, here are the steps to solve this problem:

1) 24 is divisible by 3. So any sum of 3 multiples of 3 that adds to 24 will have at least one multiple that is 6 (2 x 3) or 9 (3 x 3).

2) We can represent the multiples as: 3n, 3n+1, 3n+2 where n is an integer.

3) The 3n terms can only be 3, 6, 9, 12, 15, 18, 21. The 3n+1 terms can be 4, 7, 10, 13, 16, 19, 22. And 3n+2 terms can be 5, 8, 11, 14, 17, 20, 23.

4) We need to count the number of combinations of these terms that add to 24. Some options are:

3 + 9 + 12 = 24

6 + 9 + 9 = 24

12 + 6 + 6 = 24

15 + 3 + 6 = 24

18 + 3 + 3 = 24

5) In total, there are 5 options with 3 terms.

6) Additionally, we could have 4 term sums like:

3 + 6 + 9 + 6 = 24

6 + 6 + 6 + 6 = 24

There are 2 four-term options.

7) In total, there are 5 + 2 = 7 number of ways to write 24 as a sum of at least 3 positive integer multiples of 3.

Does this help explain the steps? Let me know if you have any other questions!

Therefore, the standard form of the equation Y=-x+9 is -x - Y = -9.

Y=-x+9 in standard form

To write the equation Y=-x+9 in standard form, we need to express it in the form Ax + By = C, where A, B, and C are constants.

First, let's add x to both sides of the equation to get:

x + Y = 9

Now, we need to make sure that the coefficients of x and y are integers with a common factor of 1. To do this, we can multiply both sides of the equation by -1:

-x - Y = -9

Therefore, the standard form of the equation Y=-x+9 is -x - Y = -9.

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Therefore, the standard form of the equation Y=-x+9 is -x - Y = -9.

Y=-x+9 in standard form

To write the equation Y=-x+9 in standard form, we need to express it in the form Ax + By = C, where A, B, and C are constants.

First, let's add x to both sides of the equation to get:

x + Y = 9

Now, we need to make sure that the coefficients of x and y are integers with a common factor of 1. To do this, we can multiply both sides of the equation by -1:

-x - Y = -9

Therefore, the standard form of the equation Y=-x+9 is -x - Y = -9.

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