Khan Academy - systems of equations http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq Solving Systems by Substitution (Youtube) http://www.youtube.com/watch?v=LxairunJTwI
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Purple Math - Quadratic inequalities (3 pages) http://www.purplemath.com/modules/ineqquad.htm Khan Academy - Quadratic Inequalities http://www.khanacademy.org/math/algebra/quadratics/quadratic_inequalities/v/quadratic-inequalities
This wiki contains links to resources related to the topics in Math 20-1 http://abmath20-1.wikispaces.com/
This is a youtube channel that includes several good tutorials that cover the topics in chapter 7 http://www.youtube.com/channel/UCYVOpJ-FX-8p6hDkxaTkA7g This link will take you to a youtube channel that has lessons explaining topics from chapters 7 & 8 http://www.youtube.com/channel/UCeuBH7q5a5xeIXCoJNydOmg
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