\(\left\{{}\begin{matrix}\left|x+1\right|+\left|y-1\right|=5\\\left|x+1\right|-4y=4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}\left|y-1\right|+4y=1\\\left|x+1\right|+\left|y-1\right|=5\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}\left|y-1\right|=1-4y\\\left|x+1\right|+\left|y-1\right|=5\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}y-1=1-4y\\y-1=4y-1\end{matrix}\right.\\\left|x+1\right|+\left|y-1\right|=5\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}5y=2\\-3y=0\end{matrix}\right.\\\left|x+1\right|+\left|y-1\right|=5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}y=\dfrac{2}{5}\\y=0\end{matrix}\right.\\\left|x+1\right|+\left|y-1\right|=5\end{matrix}\right.\)
Còn lại tự thay nhé, dài quá