Enter two points and get the slope m, classification (positive/negative/zero/undefined), and both point-slope and slope-intercept forms of the line equation.
m = (y₂−y₁) / (x₂−x₁) = rise / run
Slope measures how steeply a line rises or falls. A positive slope goes up left-to-right; negative goes down. Zero slope is horizontal; undefined slope is vertical.
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