[tex]\begin{cases}8x-2y=0\\y=4x\end{cases}\Leftrightarrow \begin{cases}8x-2y=0\\-4x+y=0\end{cases}\Leftrightarrow \begin{cases}8x-2y=0\\-8x+2y=0\end{cases}\Rightarrow 0=0\Rightarrow y=4x[/tex]
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[tex]\begin{cases}8x-2y=0\\y=4x\end{cases}\Leftrightarrow \begin{cases}8x-2y=0\\-4x+y=0\end{cases}\Leftrightarrow \begin{cases}8x-2y=0\\-8x+2y=0\end{cases}\Rightarrow 0=0\Rightarrow y=4x[/tex]