Pease 1) where is the y intercept of any direct variation equation? 2) circle the equation that is a direct variation equation. 1) y=7-3x 2)3x-7y=1 3) 3x-7y=0 4) 3y=7x-1 3) what is the direct variation equation if y=8 and x = 4? 4) what is the direct variation equation if y =-5 and x = 7 /

1. where is the y intercept of any direct variation equation?

A direct variation equation is one in which the general form is:

y = k x

where k is the constant of proportionality

The y-intercept in this case is therefore zero so it is located on the origin (0, 0)

2. The equation which is a direct variation is:

                3) 3x-7y=0

                Because we can write this as:

                y = (3/7) x

3. what is the direct variation equation if y=8 and x = 4?

We solve for the value of k since we know that:

k = y/x

k = 8/4 = 2

So the equation is:

y = 2x

4. what is the direct variation equation if y =-5 and x = 7?
We also solve for the value of k since we know that:

k = y/x

k = -5/7

So the equation is:

y = (-5/7) x

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

idk

step-by-step explanation: