Question

Which of the following does not represent a function?

x 2 3 5 8
y 7 11 15 20


x −4 −2 0 5
y 3 −1 −1 10


x −5 −3 −2 0
y −32 −2 −8 −3


x −3 −3 6 2
y 0 1 5 4

Answer 1

x −3 −3 6 2
y 0 1 5 4

The last choice is not a function because x has the value -3 twice (not possible in a function)