Aplane is to be loaded with bottles of water and medical supplies to be sent to victims of an earthquake. each bottle of water serves 10 people and each medical kit aids six people. the goal is to maximize z, the total number of people , where z = 10x + 6y, and x is the number of bottles and y is the number of medical kits. using the constraints of the situation (plane weight and volume capacities) the shaded region is in the graph is obtained. which vertex of the region represents the solution to the maximization problem?