Предмет: Алгебра, автор: alexandradvorn

решите систему уравнений: решите систему уравнений
x-y=3
-x-4y=7

Ответы

Автор ответа: Jуl

0

x-y=3 x=3+y
-x-4y=7 -(3+y)-4y=7
-3-y-4y=7
-5y=10
y=-2

x=3-2
x=1

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