Solving linear systems using substitution

What if a system can't be easily graphed? What if the graph doesn't clearly show the solution? How can we use algebra to solve a system of linear equations instead?

This video goes in-depth into the substitution method of solving linear equations.

0:37 Review solving using a graph
1:24 Introduction to solving a system using algebra
1:51 Substitution method - example
5:14 Systems with no solution
7:17 Recap

Presented in ASL with English voiceover.