Systems, 2 x 2 in this case, are when you have 2 equations and 2 unknowns (letters).
Here's an example:
The goal is to find an x guy and a y guy that work in both equations.
In this chapter, I'll show you three different ways to solve these.
The first method is graphing. This is a cool method to start with since it lets you see what's going on.
We've got two equations  and they are equations of lines. Let's graph them both on the same axes and see what we get.
Hey, the two lines intersect at
the point
( 2 ,
1 ) . This means that ( 2 , 1 ) is a point in BOTH lines... So, x = 2 and y = 1 will work in the equations!

So, the answer is  . 
Checking your answers, like we did at the end there, is a really good idea... and something you should always do on a test! We're going to do it on every single problem we do!