Look at this set of ordered pairs:

Question

(15, 17)
(9,8)
(15, -8)
(-4,20)
(9, 17)
(20, -8)
Is this relation a function?
yes
no
Save answer

Answer 1

A relation is a function if each input (x-value) is associated with exactly one output (y-value).

Let's look at the ordered pairs:

1. (15, 17)
2. (9, 8)
3. (15, -8)
4. (-4, 20)
5. (9, 17)
6. (20, -8)

In this set, the input 15 is associated with two different outputs (17 and -8), and the input 9 is also associated with two different outputs (8 and 17).

Since the same input has multiple outputs, this relation is not a function.

So the answer is no.