Write an equation to describe the variation. Use k for the constant of proportionality.
-a varies directly as $r$
A) $r = k a$
B) $a = k r$
C) $r = \frac { k } { a }$
D) $a = \frac { k } { r }$

Name: Write an equation to describe the variation. Use k for the constant of proportionality. -a varies directly as $r$ A) $r = k a$ B) $a = k r$ C) $r = \frac { k } { a }$ D) $a = \frac { k } { r }$
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Question

Quizplus · Accepted Answer

Direct variation between two variables means one is a constant multiple of the other, hence $a = k r$.

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