\(\left\{{}\begin{matrix}3x+5\left(2x+8\right)=1\\y=2x+8\end{matrix}\right.< =>\left\{{}\begin{matrix}3x+10x+40=1\\y=2x+8\end{matrix}\right.< =>\left\{{}\begin{matrix}x=-3\\y=2\cdot-3+8\end{matrix}\right.< =>\left\{{}\begin{matrix}x=-3\\y=2\end{matrix}\right.\)