A company manufactures 2 models of MP3 players. Let x represent the number (in millions) of the first model made, and let y represent the number (in millions) of the second model made. The company's revenue can be modeled by the equation R(x, y) = 140z + 170y-2z - 4y - zy Find the marginal revenue equations Rz(x, y) = Ry(x, y) = We can achieve maximum revenue when both partial derivatives are equal to zero. Set R Ry = 0 and solve as a system of equations to the find the production levels that will maximize revenue. = O and Revenue will be maximized when: x= y=