Question

Решить систему {x-7y=-43, 7x-3y=67

Answer 1

$\left \{ {{x-7y=-43} \atop {7x-3y=67}} \right. ; \left \{ {{x=-43+7y} \atop {7x-3y=67}} \right.$

7*(-43+7у)-3у=67

-301+49у-3у=67

46у=67+301

46у=368

у= 368/46

у=8

х=-43+7*8=-43+56=13

Ответ: х=13; у=8