\(a,\Leftrightarrow\left\{{}\begin{matrix}x=2y-2\\4y-4+y=11\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\cdot3-2=4\\y=3\end{matrix}\right.\\ b,\Leftrightarrow\left\{{}\begin{matrix}x=2-y\\6-3y+2y=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2-7=-5\\y=7\end{matrix}\right.\\ c,\Leftrightarrow\left\{{}\begin{matrix}4y+24+3y=3\\x=2y+12\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=2\left(-3\right)+12=6\\y=-3\end{matrix}\right.\\ d,\Leftrightarrow\left\{{}\begin{matrix}-3x+56-8x=1\\y=14-2x\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=5\\y=14-2\cdot5=4\end{matrix}\right.\)
