Question

Which set of ordered pairs does not represent a function?
○ {(−6, 9), (—7, 1), (−4, −2), (-4,5)}
O {(-6, -8), (-9, 8), (6, 9), (5,8)}
○ {(3, —8), (−4, 0), (−9, −1), (8, 0)}
○ {(6,4), (−1, −9), (—9, 1), (—2, −1)}