farmer can buy two types of plant food, mix A and mix B. Each cubic yard of nix A contains 42 pounds of phosphoric acid, 28 pounds of nitrogen, and 4 ounds of potash. Each cubic yard of mix B contains 14 pounds of hosphoric acid, 28 pounds of nitrogen, and 10 pounds of potash. The minimum nonthly requirements are 630 pounds of phosphoric acid, 840 pounds f nitrogen, and 200 pounds of potash. Find the set of feasible solutions raphically for the amounts of mix A and mix B that can be used.

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