1. Graph lines to determine the solution to a system of equations
http://www.asset.asu.edu/new/mathactive/lessons/160/lesson160.swf
2. How can we find solutions to systems of equations?
http://www.mathwarehouse.com/algebra/linear_equation/systems-of-equation/index.php.
3. «Math term party» this song defines some terms that are used in algebra.
http://www.flocabulary.com/math-terms/