Which of the following sets of ordered pairs represent a function? Check all that are true.

{(-3, 7), (-2, 7), (-1, 7), (0, 7), (1, 7)}

{(1.5, 3), (2.5, 3), (5, -3), (6, 2.5), (9, 11)}

{(-27, 15), (14, 2), (37, 0), (14, 15), (-3, 7)}

{(15, -2), (-2, 15), (11, 7), (-4, -4), (10.2, 3)}

{(1, 2), (3, 4), (5, 6), (6, 10), (7, 40)}