Since this model has only two variables, we can solve the problem in two ways: graphically and using SOLVER (with SOLVER being much easier). We start by solving this graphically.

The first step is to graph the feasible region, as given in the following figure:

The next step is to put some iso-cost lines on the diagram: lines
representing points that have the same cost. We mark the optimal
point with an *X*.

**Figure 5.5:** Marketing example with Isocost Line

X is the intersection of the constraints:

The optimal solution is and

Mon Aug 24 16:30:59 EDT 1998