The generic equation of the line is: y-yo = m (x-xo) Where, m = (y2-y1) / (x2-x1) Substituting values: m = (2000-2500) / (18-22) Rewriting: m = (- 500) / (- 4) m = 125 We choose an ordered pair: (xo, yo) = (18, 2000) Substituting: y-2000 = 125 (x-18) y = 125x - 2250 + 2000 y = 125x + 250 Answer: The equation of the best fit line in slope-intercept form is: y = 125x + 250
