use the vertical line test to determine whether or not the graph is a graph of a function

Explanation:

Step1: Understand the vertical line test

A graph represents a function if every vertical line intersects the graph at most once.

Step2: Apply the vertical line test to the given graph

For any vertical line (x = a) (where (a) is a real - number), it will intersect the given graph at most once.

Answer:

function