Partial derivative with respect to x represents the rate at which demand for SUVs change concerning changes in the price X when the price is $60000 and the cost of gasoline is $5 per gallon in this case the rate of changes negative indicating that as the price of the vehicle acts increases the demand for SUVs is expected to decrease. Partial derivative with respect to y represents the rate at which demand for SUVs changes concerning changes in the cost of gasoline y when the price is $60000 and the cost of gasoline is $5 per gallon in this case the rate of changes negative indicating that as the cost of gasoline y increases the demand for SUVs is expected to decrease