Is the relation a function?

{(14, 9), (15, 8), (8, 7), (1, 9), (15, 2)}

There are two values of y for z = 15 !

So, no

Thank you both!!! :)

To determine whether the relation is a function, we need to check if each input value (x-coordinate) in the relation corresponds to exactly one output value (y-coordinate).

In this case, we have the following pairs in the relation:
(14, 9)
(15, 8)
(8, 7)
(1, 9)
(15, 2)

The relation is not a function because the input value 15 is associated with two different output values: 8 and 2. In a function, each input value should have only one corresponding output value. However, in this relation, the input value 15 has two different output values, which violates this property.