Question

Which of the following sets of ordered pairs represents a function?

A.
{ (0, -2), (-27, -13), (-10, -5), (-27, -12) }
B.
{ (-7, -14), (-9, -18), (-5, -10), (-6, -12) }
C.
{ (1, -1), (1, -27), (1, -26), (1, -17) }
D.
{ (81, 1), (81, -1), (83, 4), (86, 6) }

Answer 1

Answer: B

Explanation:

For the set of ordered pairs to be a function, each x-value has to correspond to only one y-value.

In option A, the x-value of -27 corresponds to both -13 and -12.

In option C, the x-value of 1 corresponds to -1, -27, -26, and -17.

In option D, the x-value of 81 corresponds to both 1 and -1.