# How do you solve the system #x+y=22# and #x-y=8# using substitution?

##### 1 Answer

May 24, 2015

You isolate one variable in one equation and then substitute **its** value in the **other** equation. It doesn't matter which variable and equation you choose to start, as long as you substitute it in the other one.

So, in this case, let's isolate

Now, let's substitute it in the second equation:

Now we know