Question

Which of the following sets of ordered pairs describes a function?

(A) {(2,3),(2,5),(4,7)}
(B) {(2,1),(4,3),(5,7)}
(C) {(3,-2),(2,4),(3,6)}
(D) {(-1,4),(-1,5),(2,5)}​

Answer 1

(B) {(2,1),(4,3),(5,7)}

Explanation:

If the same x value goes to 2 different y values, it is not a function

(A) {(2,3),(2,5),(4,7)} the x value 2 goes to 3 and 5

(B) {(2,1),(4,3),(5,7)}

(C) {(3,-2),(2,4),(3,6)} 3 goes to -2 and 6

(D) {(-1,4),(-1,5),(2,5)}​-1 goes to 4 and 5