No. Because a vertical line will pass through two points on the graph.
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A vertical line. Remember that one test to see if a relation is a function is the vertical line test. A vertical line would fail that of course.
Not quite. You can use a vertical line test on the graph of the inverse mapping, OR you can use a horizontal line test on the original graph. The horizontal line test is used in the same way.
A sliding test. The vertical line can meet the graph at at most one point.
Draw a graph of a given curve in the xoy plane. Now draw a vertical line so that it cuts the graph. If the vertical line cuts the graph in more than one ordinate then given graph is not a function. If it cuts the graph at a single ordinate such a graph is a function.(is called vertical line test)
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