Question

Which set of ordered pairs represents a function?

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

Answer 1

{(2,9),(-4,-6), (9,6), (0,6)}​

Explanation:

A function has no repeating inputs (x-values) in a given set of ordered pairs.

The bottom set is a function. There are no repeating inputs in the given pairs.

All other sets have a repeating input; Therefore they are not functions.

{(9,8),(-1,7),(-1, -9), (3, -1)}

{(9,5),(4,6), (9,8),(-6,9)}

{(-8,0),(-8,2), (5, -7),(-2,-9)}

Brainilest Appreciated.