1: \(\Leftrightarrow\left\{{}\begin{matrix}y=4\\x=3+y=7\end{matrix}\right.\)
2: \(\Leftrightarrow\left\{{}\begin{matrix}4x-4y=4\\3x+4y=5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=\dfrac{9}{7}\\y=x-1=\dfrac{2}{7}\end{matrix}\right.\)
3: \(\Leftrightarrow\left\{{}\begin{matrix}2x+2y=4\\2x-3y=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=\dfrac{3}{5}\\x=2-y=2-\dfrac{3}{5}=\dfrac{7}{5}\end{matrix}\right.\)
4: \(\Leftrightarrow\left\{{}\begin{matrix}3x=6\\x-y=1\end{matrix}\right.\Leftrightarrow\left(x,y\right)=\left(2;1\right)\)
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