Lesson 7.1
Ex 1 http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-228s.html
Ex 2, 3. http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-229s.html
Ex 4, 5 http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0701#
Lesson 7.2 (2 videos)
Solving by substitution http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0702#
Solving real-world problems by substitution http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0702#
Lesson 7.3
Solving by elimination http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0703#
Solving by elimination (using multiplication first) http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0703#
Lesson 7.4
Write and solve a system http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0704#
Find a break even point http://phschool.com/webcodes10/index.cfm?fuseaction=home.gotoWebCode&wcprefix=ate&wcsuffix=0704#
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