Consider again the original prototype example, modified by the additional requirements (imposed by the company's marketing department) that the daily production of product must be at least 30 units, and that of product should exceed 20 units. These requirements introduce two new constraints into the problem formulation, i.e.,

Attempting to plot the feasible region for this new problem, we get
Figure 5, which indicates that there are no points on
the -plane that satisfy all constraints, and therefore our
problem is *infeasible* (over-constrained).

Fri Jun 20 15:03:05 CDT 1997