![\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=45\\ x=40 \end{cases}\implies 45=k40\implies \cfrac{45}{40}=k\implies \cfrac{9}{8}=k \\\\\\ therefore\qquad \qquad \boxed{y=\cfrac{9}{8}x}](/tpl/images/0275/3071/045f1.png)
The variables x and y vary directly. use the values to find the constant of proportionality,
...
Mathematics, 30.09.2019 02:30 mustafa455486a
The variables x and y vary directly. use the values to find the constant of proportionality,
. then write an equation that relates.
. write any fractions in simplest form.
y=45; x=40
k=?
y=?
direct variation equation: y=kx
Answers: 2
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