Read the article until the section "Linear Programming - Real-World Systems of Linear Inequalities." Scroll down to the section "Practice Problems," and watch "Systems of Linear Inequalities" video embedded in the text. Then, complete practice problems 6-16. Once you have completed the practice problems, check your answers against the answer key.

Click http://www.ck12.org/book/Basic-Algebra/section/7.6/ link to open resource.