This lesson is a review of writing linear equations for a real-world situation, setting them up as a system of equations and solving. The scenario is based on supply and demand and their equilibrium. This lesson was designed to be used in Algebra 2 as a beginning of the year review of algebra 1 skills in writing equations from a graph and a table, converting from one form of linear equation to another, and solving a system of linear equations. There is an extension for including quadratic systems and could be easily adapted to Algebra 1. Links to the lesson, short video, and lesson print outs are included.