Find an equation of variation in which $y$ varies inversely as $x$ and the following is true.
-$y=21$, when $x=20$
A) $y=1.05 x$
B) $y=\frac{420}{x}$
C) $y=\frac{1.05}{x}$
D) $y=420 x$

Question

Quizplus · Accepted Answer

In an inverse variation, $y = \frac{k}{x}$, where $k$ is the constant of variation. Given $y=21$ when $x=20$, we find $k$ by solving $21 = \frac{k}{20}$, giving $k = 420$. Thus, the equation is $y = \frac{420}{x}$.

Find an Equation of Variation in Which yyy Varies Inversely As xxx

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