Question

Which set of ordered pairs does not represent a function?

A. {(-9, -4), (-2, -6), (4, -3), (-6, -6)}
B. {(7, 9), (−2,−7), (2, 6), (−4, 6), (−4, 6)}
C. {(-3, -9), (-8, 7), (-4, -9), (-9, -6)}
D. {(4 -9), (0,5), (8,2), (4, -8)}

Answer 1

D does not represent a function--the x-value of 4 corresponds to two y-values.