In this video, Salman Khan of Khan Academy explains linear equations. Part 4 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains linear equations. Part 3 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains linear equations. Part 2 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains linear equations. Part 1 of 4.
Khan Academy

Gives a detailed explanation of how to use interval notation, followed by numerous examples, from very simple to quite complex.
Connexions

This site provides graphing tools. The GCalc 3 menu has several options for graphing. One nice aspect of this site is that multiple functions can be graphed in different colors on the same screen. Another useful feature is that it is easy to copy and paste or print the graphs that are generated.
GCalc  Java Online Graphing Calculator

In this Early Edge video lesson, you'll learn more about Graphing Equations, so you can be successful when you take on highschool Math & Algebra.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Slope and yintercept, so you can be successful when you take on highschool Math & Algebra.
The Princeton Review
