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 Geometry and Trigonometry
 Direct variation
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jish
Junior Member

USA
4 Posts

Posted - 09/10/2007 :  22:46:49  Show Profile
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
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tkhunny
Advanced Member

USA
1001 Posts

Posted - 09/10/2007 :  23:01:31  Show Profile
Interestingly, that's NOT a Direct Variation problem. That constant term makes it a different animal.

F = (9/5)C + 32

Subtract 32 (Why did I pick "32"?)

F - 32 = (9/5)C

Multiply by (5/9) (Why did I pick "5/9"?)

(5/9)[F - 32] = C
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sahsjing
Advanced Member

USA
2399 Posts

Posted - 09/14/2007 :  19:56:55  Show Profile
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
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sahsjing
Advanced Member

USA
2399 Posts

Posted - 09/16/2007 :  19:33:56  Show Profile
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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