*x*

_{1}

*y*

_{1}=

*x*

_{2}

*y*

_{2}

Contrast that with the more common proportionality you'll see, which is DIRECT proportionality:

*x*

_{1}/

*y*

_{1}=

*x*

_{2}/

*y*

_{2}

Basically, what all this means is:

- If two variables are
**inversely proportional**, one will go up as the other goes down. - If two variables are
**directly proportional**, they both go up at the same time.

If

*x*and*y*are inversely proportional, then so are*x*^{2}and*y*^{2}. And if those two are inversely proportional, taking the inverse of ONE of them will create direct proportionality. So 1/*x*^{2}is directly proportional to*y*^{2}. That's answer choice (E).
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