Question

Which set of ordered pairs does not represent a function?

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

Answer 1

The second one [(-5,-5),(-1,-8),(-7,0),(-5,-9)]

Explanation:

This is because there is more than 1 point with the same X-Value