The oxygen index in an aquarium is represented by following equation : 1 = x + y - 9xy + 27 where x and y are the coordinates in xy plane. Solve for the absolute extrema values for oxygen index on the region bounded by 0 S x s5 and 0 sy s 5. Identify the location in the aquarium with the lowest oxygen index. List down all the assumptions/values/methods used to solve this question. Compare the answer between manual and solver program, draw conclusion for your finding
