AlgebraBugsMe: Linear Equations Shmoop: Graphing Horizontal and Vertical Lines
CoolMath: Solving Equations Shmoop: Slope
MathBits: Equations and Inequalities Shmoop: Intercepts
MathBits: Graphing Shmoop: Slope-Intercept Form
MathIsFun: Linear Equations VirtualNerd: Equations and Functions
Shmoop: Graphing Lines by Plotting Points