The coefficient and the variable are mathematical expressions used to represent algebraic expressions.
For example, in the expression: 5a, the coefficient is 5 and the variable is a.
In algebra, a lowercase letter is used to represent a variable. A variable is a number that is not know.
The coefficient is a number, and the variable is represented by a lowercase letter. The most common letter used to represent a variable is x, but any lowercase letter can be used.
5x = x * x * x * x * x
That is, 5x = x multiplied by itself five times.