UNBOUNDED SOLUTION In some LP models, the solution space is unbounded in at least one variable-meaning that variables may be increased indefinitely without violating any of the constraints. The associated objective value may also be unbounded in this case. maximize 2. x1 + x2 (10) Subject to: x1 - x2 10 (11) 2.X1 - 12 40 (12) X1, 12 20 (13) 2 XI X2 X3 X4 rhs Basic Var Iteration : Z X1 X2 X3 X4 rhs Iteration 1: Basic Var 2 X X2 X 14 rhs Basic Var Iteration 2: Figure 3: Graphical Solution