Question

Which relation is a function?

{(6, 0), (–7, 14), (–2, –5), (–2, 5)}


{(–1, 3), (5, 3), (–6, 7), (9, 0)}


{(0, –7), (4, –8), (0, –9), (4, –10)}


{(2, 4), (2, –7), (2, 11), (2, –15)}

Answer 1

{(–1, 3), (5, 3), (–6, 7), (9, 0)} is the correct answer.
I hope this helped!