Question

1. which graph is an example of a function?

a. graph of a parabola
b. graph of a circle

Explanation:

To determine if a graph is a function, we use the vertical - line test. A graph represents a function if every vertical line drawn on the coordinate plane intersects the graph at most once.

• For graph A (a parabola opening upwards), any vertical line will intersect the graph at most once.
• For graph B (a circle), there are vertical lines (e.g., \(x = 0\)) that intersect the graph at two points.

Answer:

A.