Answer:
The third option
Step-by-step explanation:
1. To determine whether a relation is a function given a graph, use the
following criterion:
- if every vertical line you can draw goes though only 1 point, then the relation is a function
- If you can draw a vertical line that goes though 2 or more points, y is not a function of x.
- This is called the vertical line test.
2. As you can see, if you draw a vertical line at a specific place in the third graph, it will go through 2 or more points.
Therefore, the correct answer is the third option/graph.
