VARIABLE
Definition of Variable
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 yB. 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
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