Variables are (usually) letters or other symbols that represent unknown numbers or values.

Examples of Variable

The following are examples of algebraic expressions and equations containing variables.
2x + 5 = 10, the variable here is x
7y + 10 = 24, the variable here is y
a^{2} + b^{2}, the variables here are a and b

Video Examples: What is a variable?

Solved Example on Variable

Ques: Identify the variables in the equation, y = 3x+2

Choices:

A. 2 and y
B. x and y
C. x and 3
D. 2 and 3
Correct Answer: B

Solution:

Step 1: Variables are letters or other symbols that represent unknown numbers or values
Step 2: Therefore, x and y are the variables in the given equation y = 3x+2