Question

Which of the following relations is a function?

{ (-2, 4), (-1, 3), (5, 2), (1, 4) }
{ (1, 7), (1, 8), (2, 7), (3, 8) }
{ (2, 4), (4, 6), (4, 8), (6, 4) }
{ (5, 7), (6, 3), (8, 6), (5, 4) }

Answer 1

A.because x does not repeat twice but in B 1 repeats twice and in C 4 repeats twice and in D 5 repeats twice

Answer 2

The answer would be A