Question

determine whether each graph represents a function. select yes or no for each graph.
yes no
yes no

Explanation:

Step1: Apply Vertical Line Test (Graph1)

A graph represents a function if any vertical line intersects it at most once. For the first graph, all points lie on $x=1$, so a vertical line $x=1$ intersects at 9 points.

Step2: Apply Vertical Line Test (Graph2)

For the second graph, every vertical line intersects the graph at most once (each $x$-value has only one $y$-value).

Answer:

First graph: No
Second graph: Yes