Question

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

Answer 1

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