Which sets of ordered pairs represent relations that are functions? you may choose more than one correct answer.
{(1, 0). (2.0), (3, 0). (4,0))
{(2,3), (2, 4), (2, 5), (2, 6))
{(1, 1), (2, 2), (3, 3). (4,4))
{(1, 3). (-1, 4). (1.,3)}
[(6-, 6), (5,-,5)}