Use addition to solve the linear system of equations.
x-y=4
x+2y=4

Hey, There 20percntcooler! :)

To solve these equations, we will need to substitute.

or 


We can substitute this for x so, we don't have to deal with two different variables.

or if substituted:


Solve for y.

Add like terms.

Subtract 4 from both sides.


Divide both sides by 3.



Now lets input the value for y into the equation to find the value of x.

Add 0 to both sides.






Hope this helps.
-Benjamin