Question

Решите систему
2(х+2у)-3(х-у)=5
4(х+3у)-3у=17

Answer 1

2х+4у-3х+3у=5,
4х+12у-3у=17;

-х+7у=5, /*4
4х+9у=17;

-4х+28у=20,
4х+9у=17;

37у=37,
4х+9у=17;

у=1,
4х=8;

у=1,
х=2.