Предмет: Математика, автор: Aleks12121212

Решите систему уравнений способом сложения:
{2x+7y-44=0
{2x-3y=-36

Ответы

Автор ответа: 112004

{2x+7y-44=0
{2x-3y+36=0

{2x+7y-44=0 умножаем на (-1)
{2x-3y+36=0

{-2x-7y+44=0
{2x-3y+36=0

{-2x-7y+44=0
+ {2x-3y+36=0

{-10y+80=0

-10y=-80
y=+8

теперь находим х :
2x+7y-44=0
2x+7*8-44=0
2x+56-44=0
2x+12=0
2x=-12
x=-12/2
x=-6

Ответ: х=-6,у=8.

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