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jish
Junior Member

USA
4 Posts

 Posted - 09/10/2007 :  22:46:49 I am confused about how direct variation equations are answered. An example i would really like solved is F=9/5C +32 for C Edited by - jish on 09/10/2007 22:50:52

tkhunny

USA
1001 Posts

 Posted - 09/10/2007 :  23:01:31 Interestingly, that's NOT a Direct Variation problem. That constant term makes it a different animal.F = (9/5)C + 32Subtract 32 (Why did I pick "32"?)F - 32 = (9/5)CMultiply by (5/9) (Why did I pick "5/9"?)(5/9)[F - 32] = C

sahsjing

USA
2399 Posts

 Posted - 09/14/2007 :  19:56:55 Go deeper!Find at what temperature in Co the temperature in F is numerically twice the temperature in Co. Edited by - sahsjing on 09/14/2007 19:58:08

sahsjing

USA
2399 Posts

 Posted - 09/16/2007 :  19:33:56 David,I just gave the problem in a quiz in my Chemistry class and would like to share it with jish.
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