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![\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] \rule{34em}{0.25pt}\\\\ \stackrel{\textit{\underline{s} is directly proportional to \underline{r}}}{0.90r=s}\qquad \qquad \qquad 0.90\impliedby \textit{constant of variation}](/tpl/images/0434/6423/28191.png)
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If the equation is 0.90•r=s is it proportional?...
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