Explain how a graph fails the vertical line test.
Solution:-
The vertical line test is a procedure to check to see if a graph of a relation is a function. Any vertical line drawn through the graph cannot intersect the graph more than once. If any vertical line intersects more than once, the graph fails the vertical line test, and the graph is a relation. If any vertical line only intersects once, the graph passes the vertical line test, and the graph is a function.