Question

Решите систему уравнений:

2x + 3(x + y) = 11
7(x+3y) - 6x = -59

Answer 1

7х+21у-6х=-59
Х=-21у-59

2х+3х+3у=11
5х+3у=11
5*(-21у-59)+3у=11
-105у-295+3у=11
-102у=11+295
У=306/-102
у=-3
Х=-21*(-3)-59
Х=4