Mathematics, 22.11.2019 12:31 pearlvldz
If the point (2, -10) lies on the graph of a direct variation, which represents the direct variation equation?
a: y = -20x b: y = -5x c: y = -20/x d: y = -5/x
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] ~\dotfill\\\\ (\stackrel{x}{2},\stackrel{y}{-10})~~ \textit{we know } \begin{cases} x=2\\ y=-10 \end{cases}\implies -10=k2\implies \cfrac{-10}{2}=k\implies -5=k \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill y=-5x~\hfill](/tpl/images/0386/3696/27813.png)
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If the point (2, -10) lies on the graph of a direct variation, which represents the direct variation...
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