Question

look at this mapping diagram:
domain
9
15
18
-7
-17
range
-18
18
6
12
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 9: paired to -18 (one range element).
• Domain element 15: paired to 18 (one range element).
• Domain element 18: paired to 18 (one range element).
• Domain element -7: paired to 6 (one range element).
• Domain element -17: paired to 12 (one range element).

Each domain element has only one range pair.

Answer:

yes