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Suppose c and d are inversely proportional. If c=9 when d=8, find the value of d when c=8.

 Dec 23, 2021
 #1
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If c and d are inversely proportional, then c*d always stays the same. c=9 when d=8, so c*d is always 72. This means that d=72/8=9 when c=8.

 Dec 23, 2021
 #2
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c = k/b      k = proportionality constant

cb = k 

9*8 = 72    ( this is  k )

 

8 * b = 72

b = 9

 Dec 24, 2021

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