Im not sure, but I think you might be referring to something also known as the "vertical line" test. Basically, it says that a graph is a function only if a vertical line drawn at any point on the graph interesects the graph just once.
Im not sure, but I think you might be referring to something also known as the "vertical line" test. Basically, it says that a graph is a function only if a vertical line drawn at any point on the graph interesects the graph just once.
