Предмет: Алгебра, автор: virus1256

Решите систему уравнений
∫х+4у=9
∫3х+7у=2

Ответы

Автор ответа: Аноним

0

Х + 4у = 9
3х + 7у = 2
Решение способом сложения
- 3х - 12у = - 27
- 5у = - 25
у = 5
Х + 20 = 9
Х = - 11
Ответ ( - 11 ; 5 )

Автор ответа: Sanyasha

0

x=9-4y
3(9-4y)+7y=2
27-12y+7y=2
25=5y
y=5

x=9-4y=9-4*5=9-20=-11
Ответ: (-11;5)

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