Mathematics, 01.07.2019 02:10 hockeykid7583
Write an appropriate direct variation equation if y = 8 when x = 4.
Answers: 1
![\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}\\\\ \textit{we know that } \begin{cases} y=8\\ x=4 \end{cases}\implies 8=k4\implies \cfrac{8}{4}=k\implies 2=k \\\\[-0.35em] ~\dotfill\\\\ ~\hfill y=2x~\hfill](/tpl/images/0037/0421/b9d70.png)
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Write an appropriate direct variation equation if y = 8 when x = 4....
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