Решите систему уравнений: \(\begin{aligned}\begin{cases}7(x+y)-9(x-y)=86{,}\\8(x+y)+7(x-y)=81{.}\end{cases}\end{aligned}\) \( x=\) \( ;\)\( y=\) \( .\)

Задание

Решите систему уравнений:

\(\displaystyle\begin{aligned}\begin{cases}7(x+y)-9(x-y)=86{\small,}\\8(x+y)+7(x-y)=81{\small.}\end{cases}\end{aligned}\)

\(\displaystyle x=\) [ ] \(\displaystyle ;\)\(\displaystyle y=\) [ ]\(\displaystyle .\)