Question

Which of the following does not represent a function?

x 1 3 5 7
y 7 11 15 11


x −4 −2 0 2
y 3 −1 −5 −9


x −4 −3 −2 −1
y −32 −18 −8 −2


x −3 2 6 2
y 0 1 5 4

Answer 1

x 1 3 5 7
y 7 11 15 11

Answer 2

the 1st one doesn't

Answer 3

Because function assigns exactly one output to each input.