This site gives a nice review of solving simple systems of equations.
This site gives a review of solving simple systems of equations by adding with links to solving simple systems using other methods. This is a great site if you take this link along with the other links provided at this site.
Here is a site for solving systems of equations by graphing.
You need to solve the first equation for y and enter the result on the line called f1(x), and then solve the second equation for y and enter the result on the line called f2(x). Finally, look for the point of intersection.