Question

Решите систему уравнений {x-y=10
{2x-3y=20

Answer 1

$\left\{\begin{array}{c}x-y=10\\2x-3y=20\end{array}\right.\\\left\{\begin{array}{c}x-10=y\\\frac{2x-20}3=y\end{array}\right.\\x-10=\frac{2x-20}3\\3x-30=2x-20\\x=10\\y=x-10=10-10=0\\(10;0)$