Question

решите систему уравнений
у-2х=2,
2х-4у=8

Answer 1

Слаживаем и получаем -3у=10;
у=-10/3
х=-(2+10/3)/2=-8/3

Answer 2

2х = y - 2
2x = 4y + 8
y - 2 = 4y + 8
3y = - 10
y = - 3 1/3
2x = - 3 1/3 - 2 = - 5 1/3
x = - ( 16/3 ) : 2 = - 16/6 = - 8/3 = - 2 2/3
Ответ ( - 2 2/3 ; - 3 1/3 )