Links

History

This is one of the best all around sites that I have found. It is titled "The MacTutor History of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/

This is an award-winning site that links to all sorts of mathematics information.
http://archives.math.utk.edu/

Reference Topics

This site is reviews translating word problems into systems of equations.
http://www.purplemath.com/modules/systprob.htm

You can use the calculator at this site to solve the system of equations that you obtain from the word problems in this section.
http://www.analyzemath.com/Calculators/Calculator_syst_eq.html