Variables

In mathematics, a variable is a symbol used to represent an unknown or changing quantity. It is a placeholder for a number or value that can vary in different situations.

Types of Variables

There are different types of variables, including:

• Independent variable: This is a variable that stands alone and isn't changed by the other variables you are trying to measure. For example, in the equation y = 2x + 3, x is the independent variable.
• Dependent variable: This is a variable that depends on other factors. For example, in the equation y = 2x + 3, y is the dependent variable.

Using Variables in Equations

Variables are commonly used in equations to express relationships between quantities. For example, in the equation y = 2x + 3, x and y are variables representing numbers that can change. By substituting different values for x, we can find the corresponding values of y.

Example

Let's consider the equation y = 2x + 3. If we substitute x = 5 into the equation, we get y = 2(5) + 3 = 13. So, when x is 5, y is 13.

[Variables] Related Worksheets and Study Guides:

• AlgebraMathematics • Fourth Grade
• Equations and inequalitiesMathematics • Eighth Grade