Question

What would be an example of a NON function.
3,1 5,2 6,3 5,4 3,5 ?

Answer 1

Would that be a NON function?

Answer 2

yes
because of 3 appearing twice in the domain

Answer 3

or 0,1 1,5 3,5 4,6 8,7?

Answer 4

But both of these show a repeating number, I don't know which one would be the NON function.

Answer 5

this last one is a function - the repeating number is in the range not the domain