Question

six graphs are shown below. click on the tabs to see them.
graph 1 graph 2 graph 3 graph 4 graph
check the box corresponding to each graph that represents a function.
graph 1 graph 2 graph 3 graph 4 graph 5 graph

Explanation:

To determine if a graph represents a function, use the Vertical Line Test: any vertical line drawn on the graph should intersect the graph at most once. For Graph 3, a vertical line (e.g., $x=4$) intersects the graph at two points, so it fails the test and is not a function.

Answer:

Graph 3 does NOT represent a function (so the box for Graph 3 should remain unchecked).