Question

look at this mapping diagram:
domain
15
0
10
7
-13
12
range
16
15
4
14
-20
is this relation a function?
yes no

Explanation:

Step1: Recall function definition

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

Step2: Check domain elements

Check each element in the domain (15, 0, 10, 7, -13, 12). Each of these domain elements has only one arrow (one mapping) to the range. So no domain element is paired with more than one range element.

Answer:

yes