Question

{(2, 2),(4, 4),(6, 6),(8, 8)}
{(0, 3),(3, 5),(5, 6),(8, 4)}
{(1, 2),(3, 3),(4, 8),(6, 3)}
{(3, 4),(5, 2),(5, 6),(7, 3)}

which ones are functions

Answer 1

The first and second one

Answer 2

Answer:

(2,2) (4,4) (6,6) (8,8) (1,2) (3,3) (4,8) (6,3)