Question

is this graph a function or not a function? (with a graph of a curve on a coordinate plane)

Explanation:

Step1: Recall Vertical Line Test

A graph represents a function if no vertical line intersects the graph at more than one point.

Step2: Apply Vertical Line Test

For the given parabola - shaped graph, any vertical line will intersect the graph at most once. So it passes the vertical line test.

Answer:

Is a Function