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| GRAPHS
AND THE VERTICAL LINE TEST |
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The graph shown is the graph
of y = x2.
When a function is defined as a graph, there is
an easy test to decide whether the graph represents a function. It is
called the Vertical
Line Test. Basically hold a pencil (representing a vertical
line) in a vertical position and slide the pencil across the graph, if
there
is more than one point where the pencil intersects the
graph, then the curve is not the graph of a function. |
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