Предмет: Алгебра, автор: ekaterina9902

решите систему уравнений:
8х-3у=-8,
5у-2х=19

Ответы

Автор ответа: romashkadn76
0
8х-3у=-8,  8х - 3у = -8,  первое уравнение переписываем 8х - 3у = -8 
5у-2х=19, -2х + 5у = 19, умножаем на 4,                          -8х+20у =76

8х - 3у = -8,  8х-3*4=-8, 8х-12=-8, 8х=-8+12, 8х=4, х=0,5
17у=68, у=68:17, у=4
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