Sangeetha Pulapaka
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STEP 1: Recall what is a relation

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

STEP 2: Recall what is a function

STEP 3: Recall what is the vertical line test

The vertical line test is a method that is used to determine whether a given relation is a function or not. The approach is rather simple. Draw a vertical line cutting through the graph of the relation, and then observe the points of intersection.if the vertical line intersects the graph more than once this suggests that a single x-value is being associated with more than one value of y

y. This condition causes the relation to be “disqualified” or not considered as a function.

STEP 4: Determine if the given relation is a function or not

Draw a vertical line through all the points given

Notice that the vertical line at the leftmost corner is touching the graph at two points. This means the given graph is not a function

More skills you may further want to recall:

What is a vertical line

https://www.mathopenref.com/coordvertical.html

How to read an ordered pair from a graph