Which pair of points tells you the relation is NOT a function?
{(1, 4), (8, 4), (3, 1), (1, 0), (6, 3)}
answers:
(1, 4) and (1, 0)

(1, 4) and (6, 3)

(1, 4) and (8, 4)

(1, 4) and (3, 1)