Solve the linear programming problem by the method of corners. Find the minimum and maximum of P = 4x + 3y subject to 3x + 5y greaterthanorequalto 20 3x + y lessthanorequalto 16 -2x + y lessthanorequalto 1 x greaterthanorequalto 0, y greaterthanorequalto 0. The minimum is P = at (x, y) = (). The maximum is P = at (x, y) = ().