CK-12 Foundation
Ck 12: Algebra: Linear Systems With Multiplication
[Free Registration/Login may be required to access all resource tools.] Solve systems of linear equations that require multiplication and addition or subtraction to eliminate one of the variables.
CK-12 Foundation
Ck 12: Algebra: Comparing Methods for Solving Linear Systems
[Free Registration/Login may be required to access all resource tools.] Decide which method is the best one to use to solve a system of linear equations.
Khan Academy
Khan Academy: Elimination Method Review (Systems of Linear Equations)
Explains how to use elimination to simplify and solve systems of linear equations. Includes practice problems and explanations of their solutions.