The French mathematician, Renee Descartes.
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It was the French mathematician Rene Descartes.
The slope was always there
Formula for slope m is (y2 - y1)/(x2 - x1).
Point Slope Formula: y-y1 = m(x - x1)
The formula for finding the slope of the line is this: m = (Y2-Y1)/(X2-X1)