Relations & Functions

2-1 Relations & Functions

http://www.khanacademy.org/math/algebra/algebra-functions/v/relations-and-functions

2-1 More on Functions(Vertical Line Test)

http://www.khanacademy.org/math/algebra/algebra-functions/v/testing-if-a-relationship-is-a-function

1-6 Absolute Value Equations

http://www.khanacademy.org/math/algebra/absolute-value/v/absolute-value-equations