SOLUTION: how can you tell when a graph is a function or not a function?

Algebra ->  Graphs -> SOLUTION: how can you tell when a graph is a function or not a function?       Log On


   

Question 160675: how can you tell when a graph is a function or not a function?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
Imagine "vertical lines" drawn anywhere along the graph AND it ONLY crosses the graph ONE time it is a function. Otherwise, if it crosses the graph MORE than one time, it is NOT a function.