If f(x) is a linear function, which statement must be true?

A linear function has the form f(x) = mx + b, where m and b are constants. It may have a constant term and an x-term, and their coefficients do not have to be 1. It cannot have an x²-term, so the statement that must be true is “f(x) has no x²-term.”

AI-written and checked against the verified answer.