Which sets of ordered pairs represent functions from A to B? (Select all that apply.)

Question

A = {3, 4, 5, 6} and B = {−2, −1, 0, 1, 2}

{(3, 2), (6, 0), (4, 1)}


{(3, −1), (5, 2), (4, −2), (6, 0), (4, 1)}


{(3, 1), (4, −2), (5, 0), (6, 2)}


{(3, 0), (4, 0), (5, 0), (6, 0)}

Answer 1

if each x-value is used only once, then it is a function

Answer 2

Would the last option count because it would be y=0x?