STEP 1: Recall how to choose the correct mapping diagram for the ordered pairs given

https://www.qalaxia.com/viewDiscussion?messageId=5d5527e861aa724cef7ed483

STEP 2: Draw the mapping diagram

STEP 3: Recall when is a relation said to be a function. A relation is said to be a function when the domain is not repeated more than once. As you can see the number 5 is repeated twice and the number 2 is also repeated twice in the set of ordered pairs given and the mapping diagram drawn.

So, the given relation is not a function.

Skills you may want to further recall:

What is a relation

https://study.com/academy/lesson/relation-in-math-definition-examples.html

What is a domain and a range

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

When is a relation said to be a function

https://www.chilimath.com/lessons/intermediate-algebra/relations-and-functions/

What is a mapping diagram

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