Предмет: Алгебра, автор: kirjakovdanil

решите систему уравнений методом подстановки 2 х у=1 и 5х 2у=13 всё по этапам

Ответы

Автор ответа: 373050026
0
если я правильно все понимаю ьл
1 ур 2х-у=1
2 урю. 5х-2у=1
из первого уравнения выражаем у
1 ур 2х-1=у
2 урю. 5х-2у=1
Подставим первое уравнение во второе и отдельно его решим
5х-2(2х-1)=1
5х-4х-2=1
5х-4х=1+2
х=3
Вернемся в нашу систему
1 ур 2х-1=у     1 ур. 2*3-1=у   1 ур.  6-1=у       1 ур. у=5
2 ур. х=3        2 ур.  х=3         2 ур.  х=3         2 ур.  х=3  
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