The Slope Formula
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State
The slope formula computes rise over run from coordinates: m = (y₂ − y₁)/(x₂ − x₁) for any two points on the line.
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Through (1, 2) and (4, 8): m = (8 − 2)/(4 − 1) = 6/3 = 2.
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Subtract in the same order upstairs and down.
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