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Ratio Variation
i). We say that x is directly proportional to y, if x = ky for some constant k and we write,
\begin{aligned}
x \propto y
\end{aligned}
ii). We say that x is inversely proportional to y, if xy = k for some constant k and
we write
\begin{aligned}
x \propto \frac{1}{y}
\end{aligned}
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