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)}

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)

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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)}

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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)}