Find the minimum and maximum values of z=2x+7y, if possible, for the following set of constraints. x+y6 -x+y2 2x-y8 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The minimum value is OB. There is no minimum value. (Round to the nearest tenth as needed.) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The maximum value is OB. There is no maximum value. (Round to the nearest tenth as needed.)