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A Point-Slope equation of a straight line has this form: y - y1 = m(x-x1)We can recognize any points of the graph.(0,80000) ; (10,50000)Given:y -50,000 =______(x -10)We need to find the slope.Slope = Change in y / Change in x = 80,000 - 50,000 / 0 - 10 = 30,000 / -10 = -3,000The slope is equal to -3000. Choice A.y -50,000 = -3,000(x -10)...