Question

look at this set of ordered pairs:
(13, 20)
(0, 7)
(20, 4)
(13, 18)
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

In the ordered pairs, the x - value 13 appears in both \((13, 20)\) and \((13, 18)\). This means the input 13 has two different outputs (20 and 18).

Answer:

no