Suppose c and d are inversely proportional. If c=9 when d=8, find the value of d when c=8.
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.
c = k/b k = proportionality constant
cb = k
9*8 = 72 ( this is k )
8 * b = 72
b = 9
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