In a 1999 article in Mathematics Teacher, we demonstrated how graphing systems of linear inequalities could be motivated using real-world linear programming problems (Edwards and Chelst 1999). At that time, the graphs were drawn by hand, and the corner-point principle was applied to find the optimal solution. However, that approach limits the number of decision variables to two, and problems with only two decision variables are often transparent and inauthentic.

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Contributor Notes

Thomas G. Edwards,, and

Kenneth R. Chelst,, are colleagues at Wayne State University in Detroit. They are interested in developing mathematics concepts within authentic real-world contexts as well as supporting the teaching and learning of mathematics in middle and high school using a variety of technological tools.

(Corresponding author is Edwards
(Corresponding author is Chelst
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