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

(4,0)

Explanation:

Use elimination by adding or subtracting the equations together. Since x and x have the same coefficient, subtract:

x-y=4

x+2y=4

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

0x+y=0

y=0

Then substitute into one equation to find x.

x-(0)=4

x=4

Answer 2

(4,0)

Explanation:

Use elimination by adding or subtracting the equations together. Since x and x have the same coefficient, subtract:

x-y=4

x+2y=4

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

0x+y=0

y=0

Then substitute into one equation to find x.

x-(0)=4

x=4