m,which is the slope of a straight line on the Cartesian plane, with b being the y-intercept, can, theoretically, be any of those 3 (negative, positive, zero). If it were negative, prices would be going down, which would be the normal trend in market value. If it were zero it meant that the price would remain constant as well as if it were positive it meant that the price would increase, both of which would be unlikely…..except for antque cars LOL…. After about 25 years, the price could go UP if the car is maintained in good shape.
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