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# How to rearrange to make the denominator the subject of the formula? watch

1. I was meant to do a quick 30 minute revision session on inverse and direct proportion. However, when answering some inverse proportion questions I needed to make the denominator of fraction the subject of a formula.

The question is to find the value of d when I is 12.5

Here's the formula with the substituted values:

12.5 (inversely proportional) 200 (the constant or k) x 1/d squared

I feel stupid for not being able to do such a simple action...
2. SOLVED: managed to do it by myself, coincidentally a few minutes after posting this thread.

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Updated: March 14, 2016
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