Question

Which of the following is a function? A.) {(-2, -4/5), (-1,-1),(0,0),(-1,-1)} B.) {(-2,0),(0,1/2),(0,3/4),(1,1)} C.) {(-2,1),(-1,0),(0,1),(-2,2)} D.) {(-2,4),(-1,1),(0,0),(1,1)}

Answer 1

D.

Explanation:

A function, by the easy-to-understand definition, is a relation where no x values are shared. The only set where each x value is different is in D. All the other sets share the same x value. Example: Set C has coordinates (-2, 1) and (-2, 2). The x coordinates are the same, so this isn't a function. It is only a relation.