Example TGG.0: Suppose $y$ is a function of $x$ given by the equation $y = f (x) = 2x+ 3$.
The table, graph, and mapping diagram of this function have been created using GeoGebra.

Discussion/Explanation:Notice how the points on the graph are paired with the points on the mapping diagram.

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Martin Flashman, Sept 11, 2013, Created with GeoGebra