#### Answer

directly proportional
proportionality

#### Work Step by Step

If the quantities $x$ and $y$ are related by the equation $y=3x$, then we say that $y$ is ___directly proportional___ to $x$ and the constant of ___proportionality___ is 3.

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

directly proportional
proportionality

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