Question

Which relation is a function?

A.
{(2, 3), (1, 5), (2, 7)}
B.
{(-1, 5), (-2, 6), (-3, 7)}
C.
{(11, 9), (11, 5), (9, 3)}
D.
{(3, 8), (0, 8), (3, -2)}

Answer 1

Option b because it shows two negatives and

Answer 2

The second one is a function/Option B. In a function the x values must be different. If the x values are the same you can conclude that the relation is not a function.