Question

Use addition to solve the linear system of equations. Include all of your work in your final answer.

-x-y=4
x+2y=4

Answer 1

x=-12, y = 8

Explanation:

-x-y=4

x+2y=4

Add these two equations together to eliminate x

-x-y=4

x+2y=4

-----------------

y=8

Now we need to find x

x+2y =4

Substitute y in

x +2(8) =4

x+16 =4

Subtract 16 from each side

x+16-16 =4-16

x=-12