Select the correct answer. Which of these graphs represents a function?

W, X, Y ,Z

the answer is W

Because The vertical line test can be used to determine if a graph represents a function. The vertical line test says that if a vertical line can be drawn so that there is only one point of intersection of the line and the graph, then the graph is a function.

The only graph given that passes the vertical line test is W. Therefore, graph W represents a function.