Question

Which of the following relations is a function? Someone explain this to me please.

{(0,2),(1,2),(2,2),(3,2)}
{(2,0),(2,1),(2,2),(2,3)}
{(3,5),(4,7),(5,9),(5,11)}
{(4,5),(6,7),(8,9),(8,11)}

Answer 1

first one and the third one
a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output.

Answer 2

So its both? Because I can't choose two, which one should I go with?

Answer 3

i.e. a function is one with distinct output for each and every input.

Answer 4

sorry the first one only

Answer 5

I dont think its the third one because it says (5,9),(5,11).?

Answer 6

Ohkay thank you! Much appreciated.