This lesson is about solving a system of inequalities. A system of inequalities is two or more inequalities that contain the same variables. The solution to a system of inequalities is a set of points that satisfy all the inequalities in the system.
The most common method for finding the solution to a system of inequalities is by graphing the inequalities and finding the common region on the graph.
For a review of how to do this by hand, watch the video below.
Source: Solving Systems of Linear Equations, ttor58, YouTube