Question

Реши систему уравнений: {y+x=4 x−y=14

Answer 1

Ответ:

$\left\{\begin{array}{l}y+x=4\\x-y=14\end{array}\right\ \ \left\{\begin{array}{l}x+y=4\\x-y=14\end{array}\right\ \oplus \ \left\{\begin{array}{l}2x=18\\y=x-14\end{array}\right\ \ \left\{\begin{array}{l}x=9\\y=-5\end{array}\right\\\\\\Otvet:\ (9;-5)\ .$