[tex]\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}\\\\
-------------------------------[/tex]
[tex]\bf (\stackrel{x}{3},\stackrel{y}{24})\textit{ we also know that }
\begin{cases}
x=3\\
y=24
\end{cases}\implies 24=k3\implies \cfrac{24}{3}=k
\\\\\\
8=k\qquad therefore\qquad \boxed{y=8x}
\\\\\\
(\stackrel{x}{1},\stackrel{y}{y})\textit{ when x = 1, what is \underline{y}?}\qquad y=8(1)[/tex]
