Question

use the vertical line test to determine if y is a function of x in the graph.
choose the correct answer below.
○ y is a function of x
○ y is not a function of x

Explanation:

Step1: Recall vertical line test rule

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

Step2: Apply test to given graph

For the downward-opening parabola, every vertical line will cross the graph at exactly one point (or none, for lines outside the parabola's domain). No vertical line intersects the graph more than once.

Answer:

y is a function of x