Y varies directly as x when x= 3 and y =12 find y when x =12

1 answer:

3 0

$\bf \qquad \qquad \textit{direct proportional variation}\\\\
\textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\textit{we know that }
\begin{cases}
x=3\\
y=12
\end{cases}\implies 12=k3\implies \cfrac{12}{3}=k\implies 4=k
\\\\\\
thus\qquad \boxed{y=4x}
\\\\\\
\textit{when x = 12, what is \underline{y}?}\qquad \qquad y=4(12)$

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1 and 2 are correct!! Good Job!!

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4. on the number line put a solid dot over -4, the line will go to the left.

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Step-by-step explanation:

I hope this helps!! Also, you did great on 1 and 2, got this!!

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