Задание
Составьте систему линейных уравнений с переменными \(\displaystyle x\) и \(\displaystyle y{\small,}\) решением которой служит пара \(\displaystyle x=-2{\small,}\) \(\displaystyle y=-7{\small.}\)
\(\displaystyle \begin{aligned}\begin{cases}\\\\\\\end{cases}\\\end{aligned} \) | \(\displaystyle -9x+\)[ ]\(\displaystyle y=\)[ ]\(\displaystyle {\small,}\) [ ]\(\displaystyle x-3y=\)[ ]\(\displaystyle {\small.}\) |