\((x - 3)(x + y) = -7\)
*)Xét \(\left\{\begin{matrix}x-3=1\\x+y=-7\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=4\\4+y=-7\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=4\\y=-11\end{matrix}\right.\)
*)Xét \(\left\{\begin{matrix}x-3=-1\\x+y=7\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=2\\2+y=7\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=2\\y=5\end{matrix}\right.\)
*)Xét \(\left\{\begin{matrix}x-3=7\\x+y=-1\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=10\\10+y=-1\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=10\\y=-11\end{matrix}\right.\)
*)Xét \(\left\{\begin{matrix}x-3=-7\\x+y=1\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=-4\\-4+y=1\end{matrix}\right.\)\(\Rightarrow\left\{\begin{matrix}x=-4\\y=5\end{matrix}\right.\)
