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Slope Intercept Equation for Line

Shows slope intercept form for a line derived from 2 points, P & Q. P = (Px, Py) Q=(Qx, Qy) m = slope b=intercept Line Equation is y = mx + b
Notice that the line equation disappears when the points are arranged so that the line would be vertical. This is one good reason to use vectors and vector equations instead of a slope.