1.1: Vertical Line Test
Exercise
Determine which of the following equations are functions using the Vertical Line Test.
The vertical line test is a way to determine whether or not a relation is a function.
Here's what the test says: If you can draw a vertical line through the graph of a relation and it touches two points, your relation is not a function. If you can't draw a vertical line through two points on the relation, your relation is a function.