Introduction to Expressions

Let's look at the example 8x - 5 + 3y - 12 and identify each part:

Variables are letters that represent unknown values. In this expression, x and y are the variables.

Coefficients are the numbers directly in front of variables. The coefficient of x is 8, and the coefficient of y is 3.

Constants are numbers that stand alone without variables. In this expression, -5 and -12 are constants.