Question

PLEASE HELP!!!!!

Which set is a function?


{(0,3), (3,0), (0,4), (4,0)}

{(0,2), (2,0), (4,6), (6,4)}

{(2,6), (3,6), (4,6), (2,0)}


{(6,2), (2,0), (4,6), (6,4)}

Answer 1

A domain of a function doesn't have more than one range.

The first one is not a function because domain 0 has two different ranges, 3 and 4 ⇒ (0,3)(0,4)

The second one is a function

The third one is not a function because domain 2 has two different ranges, 6 and 0 ⇒ (2,6)(2,0)

The fourth one is not a function because domain 6 has two different ranges, 2 and 4 ⇒ (6,2)(6,4)

Answer 2

The second one is the function