Minimize subject to
P = 8x1 + 2x2 - 10x3
x1 + x2 - 3x3 ≤ 20
4x1 - x2 - 2x3 ≤ - 7
x1, x2 , x3 ≥ 0
Problem are mixed. Some can be solved by the methods presented in Sections 6-2 and 6-3, while others must be solved by the big M method.