Question

Which set of ordered pairs does not represent a function?

(0, 0), (2, 2), (5, 5)
(0, 1), (3, 4), (4, 3)
(1, 2), (3, 2), (7, 2)
(2, 3), (3, 5), (3, 7)

Answer 1

The last row, {(2, 3), (3, 5), (3, 7)}

Explanation:

In the last row, 3 is used as an x-value twice, meaning the x-value of 3 is paired with more than one y-value. That cannot happen in a function.