SOLUTION: how do you look at a graph and be able to tell wich function it is?

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Question 178573: how do you look at a graph and be able to tell wich function it is?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
you mean whether it is or isnt a function? there is one and only one y value from each value of x. therefore you perform the verical line test If there is any point at which the line intersects with the stated equation more than once then it is NOT a function.