Question

x = 3y
x + \(\dfrac{9}{3}\) = 8

Answer 1

\(\Rightarrow x+3=8\Rightarrow x=5\Rightarrow y=\dfrac{1}{3}x=\dfrac{5}{3}\)

Answer 2

\(\left\{{}\begin{matrix}x=3y\\x+\dfrac{9}{3}=8\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x=3y\\x+3=8\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}5=3y\\x=5\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}y=\dfrac{5}{3}\\x=5\end{matrix}\right.\)

Answer 3

x=5; y=5/3