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## Answers

If the vertical line intersects one point in only in a graph, then it's function.

If the vertical line intersects more than one point in a graph, then it's not a function.

What does it mean?

If the vertical line intersects more that one point, it means there are two values of x (range - the first elements) that correspond to one value of y (domain-the second elements). Remember that a function does not repeat the same element/ values in domain (x).