Question

Explain what the vertical line test is and how it is used.

Answer 1

The vertical line test is is a visual way to determine if a curve is a graph of a function or not.

Answer 2

The vertical line test is a way to determine if a relation is a function. This test determines if one input has exactly one output on the graph. If any vertical line passes through more than one point on the graph, then the relation is not a function because two different outputs have the same input