کدام دستگاه بیشمار جواب دارد؟
$\left\{ \begin{gathered}
4x + 3y = 7 \hfill \\
8x + 6y = 14 \hfill \\
\end{gathered} \right.$
2 )
$\left\{ \begin{gathered}
2x - y = 7 \hfill \\
x - 2y = 14 \hfill \\
\end{gathered} \right.$
3 )
$\left\{ \begin{gathered}
6x + 3y = 27 \hfill \\
\frac{y}{2} + 3x = 7 \hfill \\
\end{gathered} \right.$
4 )
$\left\{ \begin{gathered}
- 3y + 4x = 6 \hfill \\
- y + \frac{1}{3}x = 1 \hfill \\
\end{gathered} \right.$