Identify each part of the algebraic expression as the coefficient, constant, or variable
4x-12

A coefficient is the number that the variable is multiplied by.
The variable is the unknown value, often represented by a letter or symbol.
The constant is the number that is not affected by a variable value, hence the term "constant."

Using the logic above, we can conclude that 4 is the coefficient, x is the variable, and -12 is the constant.