Предмет: Алгебра, автор: kudrru

Решите систему уравнений способом подстановки:
х+7у=-6,
2х-5у=7.

kudrru: Спс огромное!

Ответы

Автор ответа: Аноним

x + 7y = - 6
2x - 5y = 7
=======
x = -6 - 7y
2*(-6-7y) - 5y = 7
======
2*(-6-7y) - 5y = 7
-12 - 14y - 5y = 7
-12-19y= 7
-19y = 7 + 12
y = -1
=====
x = -6 - 7 * (-1) = -6 + 7 = 1
Ответ: (1 ; -1)

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Решите систему уравнений способом подстановки: х+7у=-6, 2х-5у=7.

Ответы

Решите систему уравнений способом подстановки:
х+7у=-6,
2х-5у=7.