videos 7.1 to 7.4

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

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#