Question

look at this mapping diagram:
domain
20
18
-13
8
range
2
5
-4
-17
4
is this relation a function?
yes no

Explanation:

Step1: Recall function definition

A relation is a function if each element in the domain is mapped to exactly one element in the range.

Step2: Check domain elements

• Domain element 20: Maps to 2 (one mapping).
• Domain element 18: Maps to multiple range elements (e.g., 2, 5, etc.).
• Since 18 has more than one range mapping, the relation fails the function test.

Answer:

no