 Sangeetha Pulapaka
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STEP 1: Recall what is a function

A function is a relation which pairs exactly each input with one output.

STEP 2: Recall what is a mapping diagram

mapping shows how the elements are paired. Its like a flowchart for a function, showing the input and output values. A mapping diagram consists of a domain

( the input) and the range ( the output)

https://www.varsitytutors.com/hotmath/hotmath_help/topics/mapping-diagrams

STEP 3: Check if the given mapping diagram is a function

The given mapping diagram is a function because

1. Every input is paired with at least one output.
2. The domain is unique- the values in the domain are not repeated more than once

Further skills you may want to recall:

What is a relation

https://virtualnerd.com/algebra-2/linear-equations-functions/relations-functions/relations/relation-definition

What is the domain and range of a relation or a function

https://www.varsitytutors.com/hotmath/hotmath_help/topics/domain-and-range

How to determine if the relation is a function or not