Variable

Definition

A variable is a symbol, usually a letter, that represents one or more numbers. It is used to generalize mathematical statements and expressions.

5 Must Know Facts For Your Next Test

1. Variables can represent unknown values in equations and inequalities.
2. Common symbols for variables include letters like x, y, and z.
3. Variables can be constants if they represent a fixed value.
4. In algebraic expressions, variables can be combined with numbers through operations like addition and multiplication.
5. The value of a variable may change depending on the context of the problem.

Review Questions

• What is the role of a variable in an equation?
• Can a variable represent more than one number? Provide an example.
• How are variables typically represented in mathematical notation?

Related terms

Constant: A fixed value that does not change.

Equation: A mathematical statement that asserts the equality of two expressions.

Coefficient: A numerical factor multiplied by a variable in an algebraic expression.