Week 14- Determining if a Relation is a Function

I learned how to determine if a relation is a function. There are two ways that I know of to prove if its a function. Firstly, one way is to see if a input shows up more then once. Every input is mapped out to exactly one output. However, two different inputs can have different outputs just as long as the inputs are different. The other way to figure out if a relation is a function is the Vertical Line Test. If you draw a vertical line that intersects at only one point of the graph, it is a function. If it intersects more than once then it’s not a function. The only real challenge is paying attention on a graph or in ordered pairs, because its easy to get things mixed up.

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