Variable – Definition and Example 

 Definition:             

Variables are symbol or letters that used to represent for unknown numbers or values.

simply a single letter, that represents a number called the value of the variable.

m + n, here m and n are variables.

3x + y = 12, here x and y are variables.

a + b, here a and b are variables.

Example-Find the variables in the equation 

                           x = 3y + 2

by definition variables are symbol or letters that used to represent for unknown numbers or values.

Therefore, x and y are the variables in the given equation x = 3y + 2.

The letters a, b, c, x, y, z, m, p, q are most commonly used for variables.

In algebra the letters i and e have special values and are usually not used as a variable, and also the letter o is usually not used because it can be mistaken for 0(zero).