No to be a function a the graph has to pass the vertical line test. A vertical line can only cross a function at one point.This is because a function is a special machine that spits out a unique value of y for every x. Each input can have only one output.Imagine your are a bug crawling along the x axis of a grid. On that grid is a graph. At any point on your gug journey, look left . You see a point on the graph. It might be a function, but how do you tell? Look right. If you can't see any other point on the graph, it's a function. That means the x you stopped on has only one y.If there had been another point on the graph to see, then that x you stopped on would have had two y's that went with it, and that's possible, but we just don't call that graph a functionn.
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