the variable y varies directly as x. when x =20, y= 12 what is the value of y when x = 15a:7b:9c:18d:25

Yozh asked Sep 3, 2023

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Yozh asked Sep 3, 2023

by Yozh

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8 votes

To direct variations use a rule of three, as follow:

$\begin{gathered} (?)/(12)=(15)/(20) \\ \\ ?=12*(15)/(20) \\ \\ ?=(180)/(20) \\ \\ ?=9 \end{gathered}$ Then, when x=15, y is 9

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