Mocomi & Anibrain Digital Technologies
Mocomi: What Is an Equation?
Explains the different types of equations and provides examples to solve.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: High School Basic Algebra Review
An overview of basic high school algebra topics can be found here. Absolute value, signed numbers, inequalities and equations, mixture problems, and direct and indirect variation are all listed, each with links to questions posed by...