Functions Vertical Line Test and Mapping

“To be or not to be a function- that is the question”.  So lets say someone is trying to sell you a function and you want to know if it’s fake.  Is this really a function you might ask?  Well to protect yourself from a fraud and bad algebra grades you want to know the Vertical Line Test.  This is a great method to determine if a relation is a function. All you need to do is determine if a vertical line will pass more than once through the graph- if it passes more than once the graph is NOT a function.  Also you can determine if a relation is a function by mapping diagrams- study the notes below this is important to your algebra future..



some key topics that involve functions and vertical line test:

* range and domain
* sets of ordered pairs
* function mapping