Question

Solve the equation for y.Then find the value of y for the given value of x.
7x-xy=-18;x=-4.

Answer 1

`7x-xy=-18\ \ \ \ and\ \ \ \ \ x=-4\\\\7\cdot(-4)-(-4)y=-18\\-28+4y=-18\\4y=-18+28\\4y=8\ \ \ \ \ \ \ |:4\\y=2`

Answer 2

7x - xy = -18 x = -4

First, fill the -4 in where the "x's" are.

7(-4) - (-4)y = -18

Then, add the 28 over.

-28 + 4y = -18
+28 +28

4y = 10

Then, get the variable by itself, so you would divide the 4 over.

4y = 10
÷4 ÷4

y = 2.5