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Slope m = (y₂−y₁)/(x₂−x₁). Y-intercept b: plug one point into y = mx + b and solve. Slope represents rise over run—steepness and direction. Positive slope: left to right upward. Negative: downward. Zero: horizontal. Undefined: vertical (division by zero). Angle from horizontal: θ = arctan(m). Distance between points: √((x₂−x₁)²+(y₂−y₁)²).
m = 2