Aliteral equation has only one variable.
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A literal equation has two or more variables or letters, that are used to represent real values.

An example is the perimeter of a square, which is given by the formula,


Here, the P represents perimeter of the square and l represents the length of the square.

Since the length of a square can assume any positive value,the above literal equation has .

For instance, if





and so on and so forth.

Other examples of literal equations include:

The perimeter of a rectangle, which is given by the formula:



The formula for finding the perimeter of a circle:



The set of values that satisfy the above formulas are infinitely many.