Slope
Slope and angle of a line through two points, the equation y = mx + b and percent grade, with the solution.
The slope shows how much y changes when x increases by one.
Formula
m = (y2 − y1) / (x2 − x1) = tan α
If m > 0 the line rises, if m < 0 it falls. If x1 = x2, the line is vertical and has no slope.
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