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starwalker
@starwalker
July 2022
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Решите систему уравнений:
{x-3y=5
y-7x=1}
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rubilovalex
X=3y+5. подставляем во 2 уравнение: y-7*(3y+5)=1; y-21y-35=1; y-21y=1+35; -20y=36; y=36/(-20)= -1,8. x=3*(-1,8)+5= -5,4+5= -0,4. Ответ:(-0,4: -1,8).
3 votes
Thanks 4
starwalker
Спасибо.
АлиЖолмырзаев
Х=5+3у. х=5+3•(-1,8)
у-7•(5+3у)=1. х=5+(-5,4)
у-35-21у-1=0. х=-0,4
-20у=36
у=36:(-20)
у= -1,8
1 votes
Thanks 1
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Answers & Comments
у-7•(5+3у)=1. х=5+(-5,4)
у-35-21у-1=0. х=-0,4
-20у=36
у=36:(-20)
у= -1,8