Posted by **Pam** on Sunday, January 20, 2013 at 2:35am.

C varies inversely as J. If C = 7 when J = 0.7, determine C when J = 12

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**Reiny**, Sunday, January 20, 2013 at 8:44am
C varies inversely as J ---> C = k(1/J) , where k is a constant

when C=7, J=.7

7 = k(1/.7)

k = 4.9

so C = 4.9/J

when J=12

C = 4.9/12 = .408333..

or:

C1/C2 = J2/J1

7/C2 = 12/.7

12C2 = 7(.7)

C2 = 7(.7)/12 = .408333..

notice the actual calculations are of course the same.

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