Question

Which two sets of ordered pairs represent a function?(2 points)

(2,5), (−2,6), (2,7), (−2,8), (2,9)

(−2,1), (−1,3), (0, 5), (1,15), (2,21)

(−5,1), (−6,1), (−7,1), (−8,1), (−9,1)

(4,4), (2,9), (0,7), (−2,3), (4,2)

Answer 1

The 2nd and 3rd sets.

Reason: In set 2 the x-values (-2, -1, 0, 1, 2) are all distinct, and in set 3 the x-values (-5, -6, -7, -8, -9) are all distinct. Sets 1 and 4 are not functions because the same x-value appears with different y-values.