Modeling
Sources
Chaturvedi, Abhijit. "Solving Linear Inequalities." Connexions. February 5, 2009. http://cnx.org/content/m19599/1.1/
Stapel, Elizabeth. "Solving Linear Inequalities: Advanced Examples." Purplemath. Available from http://www.purplemath.com/modules/
ineqlin3.htm. Accessed 15 August 2010