**draw a line between two points ("reference points")**very close to your desired point, and determine the slope of that line. You can improve the accuracy of your estimate by choosing reference points closer to your desired point.

For an estimation of the instantaneous rate of change of a function at a point, **draw a line between two points ("reference points")** very close to your desired point, and determine the slope of that line. You can improve the accuracy of your estimate by choosing reference points closer to your desired point.

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