Bettinger, Alvin K. and Englund, John A.. Algebra and Trigonometry. pg 58. www.archive.org. International Textbook Company. January 1963. Last Accessed 1/12/2010. http://www.archive.org/stream/algebraandtrigon033520mbp#page/n75/mode/1up/search/jointly. Buy the book
Cite this article as:
McAdams, David E. Joint Variation. 5/5/2011. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/j/jointvariation.html.