Question

look at this mapping diagram:
domain
20
2
-19
18
range
8
4
17
-8
is this relation a function?
yes
no

Explanation:

Step1: Recall function definition

A function is a relation where each element in the domain is paired with exactly one element in the range.

Step2: Check domain elements

• Domain element 20: paired to 17 (one element).
• Domain element 2: paired to 8 (one element).
• Domain element -19: paired to 4 (one element).
• Domain element 18: paired to -8 (one element).

Each domain element has only one range pair.

Answer:

yes