Question

{2*x-y = 4,
{3*y+x = 9

Answer 1

2х-у=4
3у+х=9

2х-у=4
х=9-3у

2(9-3у)-у=4
18-6у-у=4
-7у=-14
у=2
х=9-3*2=3
Ответ: (3;2)