Предмет: Математика, автор: Pivn9x

Подскажите пожалуйста решение 21 задания

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Автор ответа: foa15

первое уравнение в системе надо домножить на -2, получится такое же уравнение, как и второе только в ответе -34
дальше, методом сложения, то есть складываем данные уравнения получается 17х-34=0, отсюда получается х=2
следующий шаг: подставляем в удобное для нас уравнение полученный результат и находим вторую переменную(в нашем случае удобнее в первое, до изменений): 2*2^2+у^2=17
у*у=9
следовательно у=3 или -3
ответ: х=2, у=3, у=-3

Автор ответа: foa15

можете отметить мой ответ, как лучший, заранее спасибо

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