Question

Which of the following does not represent a function?
Answer

x 4 5 6 8 10
y 4 -4 12 -8 6

x -10 1 3 8 10
y -2 2 7 8 10

x 5 10 10 12 18
y 1 4 22 5 4

x -12 -5 11 14 17
y -5 -2 -2 8 34

Answer 1

x 5 10 10 12 18
y 1 4 22 5 4

This does not represent a function because for x = 10, y = 4 and 22 which is not consistent with the definition of a function which states that for any input, there is a unique output.