Предмет: Алгебра, автор: ovyayvayvayv1

2x+y=12
7x-2y=31
решить 3 способами сложением ,подстановка и графически

Ответы

Автор ответа: okunkovstas5
0

Ответ:

y=12-2X

подставляем во второе равенство

7x-2(12-2x)=31

7x-24+4x=31

11x=55

x=5

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