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A function is represented by a curve on a graph.
When a vertical line is drawn and intersects the curve precisely at one point, the curve forms a function.
Example of a function
In the figure given above, the vertical line intersects the curve precisely at one point.
Therefore, the figure given above is a function.
Example of a non-function
In the figure given above, the vertical line intersects the curve at two points.
Therefore, the figure given above is not a function.
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