Section 12.1
Systems of Linear Equations

FIU has online movies to help with this topic on this page. You must have QuickTime Player, a free download, installed on your computer.

Joliet Junior College has online videos that require Windows Media Player, a free download.
Solve systems of equations by substitution
Solve systems of equations by elimination
Identify inconsistent systems of equations containing two variables
Express the solution of a system of dependent equations containing two variables

The Math Emporium at Virginia Tech has online videos. QuickTime Player, a free download, is required to view them.
Solving systems of equations

Other online help:
Solving systems of equations
The Substitution Method
The Elimination Method
Help with problems like exercise #58
Help with problems like exercise #60
Help with problems like exercise #61(see the second problem)