{ Exmpl3.3-5_Unbounded.mpl } { Winston, Operations Research, Applications and Algorithms, 4th ed. } { Chapter 3.3, Example 5, Product-Mix, Size: 2x2, Page 66 } MAX z = 2 x1 - x2; SUBJECT TO x1 - x2 <= 1; 2x1 + x2 >= 6; END