7.1 Solving Linear Systems Graphically
http://www.youtube.com/watch?v=cuNpXve18Pc
http://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-graphically/e/graphing_systems_of_equations
7.2 Solving Linear Systems Using Substitution
http://www.youtube.com/watch?v=mDw2F2zvThs
http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/systems-with-substitution/e/systems_of_equations_with_substitution
7.3 Solving Linear Systems Linear Combination/Elimination
http://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-elimination/v/solving-systems-by-elimination-2
http://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-elimination/e/systems_of_equations_with_elimination
7.4 Linear Systems and Problem Solving (word
problems)
http://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-elimination/v/solving-systems-by-elimination
7.5 Special
Types of Linear Systems
https://www.youtube.com/watch?v=MNkwN8WgpPY
http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/fast-systems-of-equations/e/solutions_to_systems_of_equations
7.6 Systems of Linear
Inequalities
http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/system-of-inequalities/v/graphical-system-of-inequalities