Problems 127–130 are based on previously learned material. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

State the domain and range of the relation that follows, and then determine whether the relation represents a function.

{(−3, 2), (−1, 4), (1, 4), (3, 2)}