7. which of the following relations are not functions? select all that apply.
o
{(1,3), (3,,11), (7,15), (9,19)}
{(1,3), (1,7), (5, , 15), (9, 19)}
{(-2 1), (2,4)}
{(2,4), (1, 1), (0,,-1), (2,-4)}
{(6,,1), (2,, -,-3)}
{(1,3), (3,,11), (7,15), (9,19)}
{(1,3), (3,,11), (9,15), (9,19)}
o
o