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Solve the following linear programming model graphically: (30 Points) minimize Z= 5x1 - 10x2 subject to: 3x1 - 5x2 ? 15 (if "a" is even then set ? to z; if "a" is odd then set ? to 3) X1/X2 ?? 5 (if "b" is even then set ?? to >; if "b" is odd then set ?? to 3) x1 + x2 ??? 10 (if "c" is even then set ??? to z; if "c" is odd then set ???to ) x ???? 3 (if "d" is even then set ???? to >; if "d" is odd then set ???? to 9 X1, X2 > 0 a=56=8c-s d=6