Teaching Notes This site is a complete resource of covering the development of solving inequalities.
Lesson & Practice This is a well done lesson complete with practice assignments and a unique "cryptic cubes" approach to an assignment variation.
Lesson & Gizmos This is an introduction to explorelearning.com and as a teacher you can get a password to explore the site, it has enormous potential for classroom use.
Notes & Examples A well done setup with multiple examples that cover all needs.
Interactive Lesson Requires InterAct Math Plug-in available at the site. Excellent interactive lessons and examples from Addison Wesley.

Math 10 Text - Regina Public

Pages 58-60

Math 10 Text - Burt Theissen

Pages 26-29