The figure above shows two curves in the plane. If no vertical line intersects it more than once.Ī plane curve which doesn't represent the graph of a function is sometimes said to have failed the vertical line test. Therefore, the vertical line testĬoncludes that a curve in the plane represents the graph of a function if and only Intersect the graph of a function at most once. Is matched to at most one value and, as a result, any vertical line in the plane can The motivation for the vertical line test is as follows: A relation is a function precisely when Of a function by visually examining the number of intersections of the curve with vertical lines. The vertical line test determines if for every value of x there is. The vertical line test is a graphical method of determining whether a curve in the plane represents the graph The vertical line test can be used to determine if a curve is the graph of a function.
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