Look at this set of ordered pairs:
(9, 8)
(0, 18)
(9, 13)
(5, 3)
Is this relation a function?
To determine if the relation is a function, we need to check if there are any repeated x-values.
In this case, we have the following x-values: 9, 0, 9, 5.
Since the x-value of 9 is repeated, the relation is not a function.