Demand for a certain kind of SUV obeys the following equation, D(x,y) = 23,000 'iNl 310.53: 10W2 Where x is the price per car in dollars, y is the cost of gasoline per litre, and Dis the number of cars. Suppose that the price of the car and the price of gasoline r years from now obey the following equations: 3: = 00,200+300r, _v=126+12\\/; What will the rate of change of the demand be (with respect to time} 2 years from now