Question

Which relation is also a function?

A.{(-1, 3), (0, 2), (3, -1), (3, 2)}
B.{(2, -4), (2, -2), (2, 1), (2, 3)}
C.{(0, 3), (1, 2), (1, 4), (2, 1)}
D.{(-4, -3), (0, -3), (1, -3), (4, -3)}

Answer 1

D.{(-4, -3), (0, -3), (1, -3), (4, -3)}

Explanation:

All of the other options have an input with multiple outputs, and this cannot happen in a function. You can, however, have an output with multiple inputs.