Question

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

x-y=4
x+2y=4

Answer 1

Answer: y=0 x=4

Explanation:

add 2x eq1 to eq2

2(x-y=4)

x+2y=4

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

3x=12

divide by 3

x=4

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

substitute x=4 into either equation

4-y=4

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

solve: -y=0

multiply both sides by -1: y=0