# How do you solve by substitution #3x + 2y = 6# and #x + 2y = -6#?

##### 2 Answers

Jun 13, 2015

#### Explanation:

Try this:

Jun 13, 2015

#### Explanation:

To solve a system by substitution, you need to replace one unknown by a function of the other, using one of the equations.

Example:

becomes

Then, in the other equation, you replace

becomes

Now that you have the value of

becomes