Question

Which of the following is an example of a function?

{(3, 4), (4, 8), (6, 6), (7, 10)}
{(0, 2), (1, -4), (1, -3), (3, 6)}
{(-1, 4), (0, 3), (0, -2)}
{(5, 7), (6, 8), (6, 9), (7, 10)}

Answer 1

for every function, only one x has a correlated y, so {(3, 4), (4, 8), (6, 6), (7, 10)} is the correct answer. All the other selections have 2 y coordinates for an x.

hope this helps!