a: \(\Leftrightarrow\left\{{}\begin{matrix}12x=24\\2x-11y=-7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\11y=11\end{matrix}\right.\Leftrightarrow\left(x,y\right)=\left(2;1\right)\)
b: \(\Leftrightarrow\left\{{}\begin{matrix}5x=10\\3x+y=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=-3\end{matrix}\right.\)
c: \(\Leftrightarrow\left\{{}\begin{matrix}8y=8\\2x=3y\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=1\\x=\dfrac{3}{2}\end{matrix}\right.\)
d: \(\Leftrightarrow\left\{{}\begin{matrix}6x=-5\\3x-2y=-3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-\dfrac{5}{6}\\2y=3x+3=3-\dfrac{5}{2}=\dfrac{1}{2}\end{matrix}\right.\Leftrightarrow\left(x,y\right)=\left(-\dfrac{5}{6};\dfrac{1}{4}\right)\)
1. x=2, y=1
2. x=2, y=-2
3. x=3/2, y=1
4. x=-5/6, y=1/4
5. x=2/3, y=11/3
