Purple Math
Purplemath: Systems of Linear Inequalities
This Purplemath lesson describes how to solve a system of linear inequalities by graphing.
Math Planet
Math Planet: Solving Linear Inequalities
Provides examples and a video lesson that illustrates how to solve linear inequalities.
Khan Academy
Khan Academy: Two Variable Inequalities Word Problems
Solve word problems that involve linear inequalities in two variables. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Math Planet
Math Planet: The Substitution Method for Solving Linear Systems
A way to solve a linear system algebraically is to use the substitution method. The substitution method functions by substituting the one y-value with the other. This resource explains this method by showing an example along with a video.