![\bf \qquad \qquad \textit{inverse proportional variation} \\\\ \textit{\underline{y} varies inversely with \underline{x}}\qquad \qquad y=\cfrac{k}{x}\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{\underline{y} varies inversely with cube of \underline{x}}}{y=\cfrac{k}{x^3}} \\\\[-0.35em] \rule{34em}{0.25pt}](/tpl/images/0251/1094/d94ba.png)
![\bf \qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{\underline{y} varies directly with square of \underline{x}}}{y=kx^2}](/tpl/images/0251/1094/ab487.png)
it isn’t hard i forgot this answer
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