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Direct variation

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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
Advanced Member

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 + 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

sahsjing
Advanced Member

USA
2399 Posts

Posted - 09/14/2007 : 19:56:55

Go deeper!

Find at what temperature in C^o the temperature in F is numerically twice the temperature in C^o.

Edited by - sahsjing on 09/14/2007 19:58:08

sahsjing
Advanced Member

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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