#### Why You Need Equations

#### What Is an Equation?

#### What Is a Variable?

#### How to Solve Equations (Change Sides, Change Signs)

#### How to Get Rid of the Number in Front of x

#### How to Solve Linear Equations (Combined Methods)

#### How to Get Rid of the Number Under x

#### How to Solve Equations with Parentheses

#### How to Solve Formulas for Specified Variables

#### How to Solve Quadratic Equations Without a Linear Term

#### How to Solve Quadratic Equations

#### How to Factorize Quadratic Expressions

#### What Is Polynomial Long Division?

#### How to Solve Cubic and Quartic Equations

#### What Are Systems of Equations?

#### Graphic Representation of Equations

#### How to Graphically Solve Systems of Equations

#### Solve Systems of Equations with the Substitution Method

#### Solve Systems of Equations with the Elimination Method

#### How to Solve Systems of Nonlinear Equations

#### Solve Systems of Equations with Multiple Unknowns

#### How to Solve Equations with Fractions

#### Solve Rational Equations with x in the Denominator

#### What Are Radical Equations?

#### What Are Power Equations?

#### How to Check Solutions to an Equation

#### How to Formulate an Equation Representing a Problem

#### What Is the Zero Product Property?

#### How to Solve Equations Using Substitution

#### How to Solve Equations by Graphing

#### How to Solve a Linear Inequality

#### How to Solve Inequalities Graphically

#### How Do Sign Charts Work?

#### How to Find the Interval of an Inequality

#### What Are Quadratic Inequalities?

#### How to Solve Inequalities of Degree 3 or More

#### What Are Rational Inequalities?