%AN EXAMPLE SHOWING THE INCLUSION OF AN EPS FILE
\documentclass[12pt]{article}
\usepackage{epsf}

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We can determine the solution of this problem geometrically\index{solution,
geometric}.  Graph the
set of all points that satisfy the constraints.  Draw some lines
for which the objective function assumes a constant value (note that
these are all parallel).  Find the
line with the highest value of $z$ that has nonempty intersection with
the set of feasible points.  In this case the optimal solution is
$(30,40)$ with optimal value $310$.

\hspace*{\fill}\epsfbox{ex1.eps}\hspace*{\fill}

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