Question

look at this mapping diagram:
domain
-2
12
3
range
-5
5
16
is this relation a function?
yes
no

Explanation:

Step1: Recall function definition

A relation is a function if every element in the domain maps to exactly one element in the range.

Step2: Check domain elements

• $-2$ maps to only $-5$
• $12$ maps to only $16$
• $3$ maps to only $5$

All domain elements have one range pairing.

Answer:

yes