Question

Which relation is also a function?

{(0, 3), (1, 2), (1, 4), (2, 1)}
{(-1, 3), (0, 2), (3, -1), (3, 2)}
{(2, -4), (2, -2), (2, 1), (2, 3)}
{(-4, -3), (0, -3), (1, -3), (4, -3)}

Answer 1

relations are functions if they have 1 output for every input
do you see any relations that dont' have repeated x values?

Answer 2

D

Answer 3

{(-4, -3), (0, -3), (1, -3), (4, -3)}