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Let P and Q have coordinates (Px, Py) and (Qx, Qy), respectively (here x and y are intended as subscripts)

Note that Py = f(Px) and Qy = f(Qx)

Slope m = (vertical difference) / (horizontal difference)

m = (Qy-Py) / (Qx-Px)

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Q: Let f r to r be an elementary function let p and q be two distinct points on the graph of f what is slope of the line determined by these two points?
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