Question

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

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 1:

• Draw vertical lines through each x-value of the plotted points. Each vertical line only touches one point (no x-value has multiple y-values). This satisfies the Vertical Line Test.

Answer:

Graph 1 represents a function.