Scroll down to the section "System of Equations and Inequalities; Counting Methods: Review," and complete the odd-numbered problems for 3-41, but do not complete problem 37. This set of practice problems will allow you to assess your mastery of the concepts in Unit 6. Once you have completed the practice problems, check your answers against the answer key.

Click http://www.ck12.org/book/CK-12-Basic-Algebra-Concepts/section/7.0/ link to open resource.