# How do you solve #x-y=9# and #2x+2y=2#?

##### 1 Answer

Nov 13, 2015

- Substitute one value by using the other
- Set equation 1 into equation 2
- Solve like a normal equation.

#### Explanation:

Rewrite equation 1:

Put

Solve like normal:

#4y = -16

Divide both sides by 4:

Put this value into equation 1:

To sum it up;