Which of the following sets of data does not represent a function? set a (x, y) (6, 3) (8 ,4) (5, 7) (9, 2) set b (x, y) (0, 3) (1, 8) (2, 8) (3, -7) set c (x, y) (10, 7) (20, 11) (30, 9) (40, 7) set d (x, y) (3, 9) (2, 2) (8, -3) (2, 1) a: set a. b: set b. c: set c. d: set d

set D

Step-by-step explanation:

For a function we need to have for evety x value, only one value of y.

in set D, we have the points (2, 2) and (2, 1)

this two points have one value of x: x=2

but for the same x we have two values of y: 2 and 1

so this does not obey the requirements to be a functios wich is that for every x, we cannot have more than one value of y.