min f = 8 x1 + 6 x2 + 3 x3 + 2 x4,
x1 + 2 x2 + x4 >=3,
3 x1 + x2 + x3 + x4>=6,
2 x3 + x4 >=2,
x1 + x3>=2,
xj>=0, j = 1, 2, 3, 4.
max f = 5 x1 + 10 x2 + 7 x3,
s.t.
3 x1 + 2 x2 + x3<=7,
-3 x1 + 4 x2 + 10 x3<=12,
5 x1 + 3 x2 + x3 >=6,
xj>=0, j = 1, 2, 3.
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