3-1 & 3-2 Solving Linear Systems - Graphing, Substitution, Elimination

Here is a video by Math Meeting called Solving Systems of Equations - Substitution Method, which explains how to solve a system using substitution.

This video by Yaymath called Algebra - Solving Systems of Equations - Elimination Method explains the elimination method with several different types. It also addresses some of the issues that arise when classifying a system.