5.2.1 Modeling
The process of modeling using linear programming is fairly consistent: dene the decision variables,
objective, and constraints.
Decision Variables. In this case, the decision variables are the number of units of each outlet
to purchase. Let x1 be the number of TV spots, and x2 the number of magazine pages.
Objective. Our objective is to minimize the amount we spend: 600x1 + 500x2. Constraints. We have one constraint for each market segment: we must be certain that we
reach sucient people of each segment. For boys, this corresponds to the constraint: