Use substitution to solve the system.
x = 3y +7
3x + 4y = 8

Answer:

Step-by-step explanation:

A) y = 2x – 7  and f(x) = 7 – 2x

Incorrect. These equations look similar but are not the same. The first has a slope of 2 and a y-intercept of −7. The second function has a slope of −2 and a y-intercept of 7. It slopes in the opposite direction. They do not produce the same graph, so they are not the same function. The correct answer is f(x) = 3x2 + 5 and y = 3x2 + 5.

B) 3x = y – 2  and f(x) = 3x – 2

Incorrect. These equations represent two different functions. If you rewrite the first equation in terms of y, you’ll find the equation of the function is y = 3x + 2. The correct answer is f(x) = 3x2 + 5 and y = 3x2 + 5.

C) f(x) = 3x2 + 5 and y = 3x2 + 5

Correct. The expressions that follow f(x) = and y = are the same, so these are two different ways to write the same function: f(x) = 3x2 + 5 and y = 3x2 + 5.

D) None of the above

Incorrect. Look at the expressions that follow f(x) = and y =. If the expressions are the same, then the equations represent the same exact function. The correct answer is f(x) = 3x2 + 5 and y = 3x2 + 5.

Answer:

(2,1)

Step-by-step explanation:

multiply by negative three on the first equation then solve

Answer:

(-2, 1)

Step-by-step explanation:

Given:

2x+8y=4...(1)

6x-y=-13...(2)

You would want to have an x or a y value that equals the same in both equations. In this case, we can multiply equation 1 by 3 so that both x's in each equation equal 6x.

(2x+8y=4) x 3...(1)

6x-y=-13...(2)

becomes...

6x+24y=12...(3)

6x-y=-13...(4)

As you can see here, both x's in this equation are equal.

Now we will be combining these equations together. Take the equal x values and make sure they will equal 0. You do that by either subtracting the entire equation or adding it. In this problem, we will be subtracting it because 6x-6x=0

(6x+24y=12) - (6x-y=-13) = 25y =25

Now that we can solve for y separately, 25y=25   y=1

To solve for x, just substitute y into one of the original equations (equations 1 or 2). For this problem, I'll use equation 1.

6x-y=-13

6x-1=-13

6x=-12

x=-2

(This is what I got for my answer and here is the explanation. I apologize if my answer is incorrect. If someone notices a mistake in my answer, please correct me, thank you and have a nice day!)

Answer:

30

Step-by-step explanation:

Answer:

i believe it is 0.2143

Step-by-step explanation:

Answer:

0.21428571428

Step-by-step explanation:

I hope this help.

Answer:

you shpuld add both then multiply it by 2

Step-by-step explanation:

Answer:

you shpuld add both then multiply it by 2

Step-by-step explanation:

Answer:

3 days

Step-by-step explanation:

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

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

Answer:

y = 4x + 13

Step-by-step explanation:

First of all, if they are parallel, they must have the same slope, so the 4x is the same. all we need to do now is to change the b to make it cross the point (-3, 1). Doing so, we see that the y-intercept becomes 13. Therefore, the equation is y = 4x + 13.

Answer:

9(x-11) = 9

9x-99 = 9

9x = 108

x = 108/9

thus,

x = 12

Answer:

[tex]8\frac{1}{2}*11=93\frac{1}{2}[/tex]

Step-by-step explanation:

Simplify the expression.

Answer: (below)

Step-by-step explanation:

y = 2x + 1

slope = 2

y-int = (0, 1)

y = 3x - 1

slope = 3

y-int = (0, -1)

y = 4x

slope = 4

y-int = (0, 0)

y = -3x - 1

slope = -3

y-int = (0, -1)

y = -x - 4

slope = -1

y-int = (0, -4)

y = (2/5)x - 1

slope = 2/5

y-int = (0, -1)

Answer:

[tex]tan^2(x)[/tex]

Step-by-step explanation:

[tex](sec(x)-1)(sec(x)+1)\\sec^2(x) - 1\\\frac{1}{cos^2(x)} -1\\\frac{1-cos^2(x)}{cos^2(x)} \\\frac{sin^2(x)}{cos^2(x)}\\ \\tan^2(x)[/tex]

Answer:

−15x+−30

Step-by-step explanation:

Distribute:

=7+(−3)(5x)+(−3)(−10)+−67

=7+−15x+30+−67

Combine Like Terms:

=7+−15x+30+−67

=(−15x)+(7+30+−67)

=−15x+−30

Answer:

Step-by-step explanation:

66

Answer:

ok so

1/3×1/4=1/12

Step-by-step explanation:

Answer:

5/12

Step-by-step explanation:

Fractions must have common denominators

1/3= 4/12

1/4=3/12

4/12+3/12=7/12

12/12-7/12=5/12

Answer:

Each employee earns $44.50

Step-by-step explanation:

When you divide $178 evenly among 4 employees, each will get $44.50.

178÷4= 44.50

Check: 44.5×4= 178

Answer:

2 3

Step-by-step explanation:

Answer:

I believe it is false. Have a great day and good luck! also super sorry if this answer ends up being wrong :/

Step-by-step explanation:

Answer: 1. 80 2. 1/3 3. -300 4. 120 pages Equation: 0.7p = 84, p=120

Answer:

C

Step-by-step explanation:

I think I'm not for sure

Answer:

w=7a+4bw-4b = 7a

Step-by-step explanation:

Answer:

Another name for angle 2 is angle DBC

Step-by-step explanation:

This is the only one in the answer choices that is correct. The order in which to follow the points to name an angle is from the endpoint, middle point, endpoint. So, D, B, C. You can also do C, B, D.

9514 1404 393

Answer:

  g - 4 = 9

Step-by-step explanation:

If the number is g, then four less than the number is g-4.

If that is 9, then you have the equation ...

  g - 4 = 9

_____

Additional comment

If you add 4 to both sides of the equation, you have its solution.

  g -4 +4 = 9 +4

  g = 13

So, 4 less than 13 is 9.

Answer:

There are 35 chickens

Step-by-step explanation:

goats : chickens: total

3               7           3+7 = 10

There are 50 animals

50/10 = 5

Multiply each number by 5

goats : chickens: total

3*5          7 *5         10*5

15              35             50

There are 35 chickens

Answer:

15 goats and 35 chickens

Step-by-step explanation:

goats to chickens - 3:7

3:7

3+7=10

50/10=5

3*5:7*5

15:35

Answer:

The number of days

Step-by-step explanation:

Answer:

Slope=3/2

Slope=rise/run

Graphing this you go up 3 and to the right 2

Y-intercept= 9

Slope intercept form= 3/2x+9

which means the y-intercept is 9

Answer:

b = 1

b = -1

a = 0

Step-by-step explanation:

Answer:

i want some kitty Kat

Answer:

a) line [EA]

b) line [HA]

Step-by-step explanation:

Answer:

a) line(EA)

b) line(HA)

Step-by-step explanation: