Предмет: Алгебра, автор: onlyanswer

РЕШИТЕ ЛИНЕЙНОЕ УРАВНЕНИЕ СПОСОБОМ СЛОЖЕНИЯ! 50 БАЛЛОВ!!!
5Z-7X=3
3Z-5X=2

onlyanswer: система

Ответы

Автор ответа: stzilla
1

Ответ:

Объяснение:

5z-7x=3

3Z-5X=2

вычитаем  5z-7x=3    ∣⋅5 (домножаем)

                   3Z-5X=2  ∣⋅7  

                5(5z−7x)−7(3z−5x)=5⋅3−7⋅2

                 4 z = 1

                 z=0,25

Найденную переменную подставим в первое уравнение

                 5(0,25)−7x=3

                  x=-0,25

Ответ: x=-0,25; z=0.25

                 

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