Whether the function given by a graph is one-to-one.
The function is not a one-to one function.
Horizontal line test states that the graph of the function is one-to-one function if and only if a horizontal line intersects the graph exactly once.
Perform the horizontal line test for the given graph.
Draw a horizontal line such that it passes through the curve as shown in Figure 1.
From Figure 1, it is observed that the horizontal line intersects the curve at two distinct points, which means it fails the horizontal line test.
Therefore, the function given by a graph is not a one-to-one function.
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