Question

look at this set of ordered pairs:
(15, 17)
(5, 14)
(0, -19)
(15, 4)
(-18, -5)
(4, 6)
is this relation a function?
yes no

Explanation:

Step1: Recall function definition

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

Step2: Check x - values

Look at the x - values in the ordered pairs: 15, 5, 0, 15, - 18, 4.
The x - value 15 appears twice, with corresponding y - values 17 and 4.

Answer:

no