\(ĐK:x+y\ne0;y\ne1\\ HPT\Leftrightarrow\left\{{}\begin{matrix}\dfrac{8}{x+y}+\dfrac{2}{y-1}=10\left(1\right)\\\dfrac{1}{x+y}-\dfrac{2}{y-1}=-1\left(2\right)\end{matrix}\right.\\ \left(1\right)+\left(2\right)=\dfrac{9}{x+y}=9\\ \Leftrightarrow x+y=1\Leftrightarrow x=1-y\\ \text{Thay vào }\left(2\right)\Leftrightarrow1-\dfrac{2}{y-1}=-1\\ \Leftrightarrow\dfrac{2}{y-1}=2\Leftrightarrow y-1=1\Leftrightarrow y=2\left(tm\right)\\ \Leftrightarrow x=-1\left(tm\right)\)
Vậy \(\left(x;y\right)=\left(-1;2\right)\)