Предмет: Алгебра, автор: АртёмБел

помогите пожалуйста решить задачу.

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Автор ответа: КоролеваЮтуба

1

Обозначаем 7y-2 за 2x, 5y-4 за x.
Значит:7y-2=2x 5y-4=x
Решаем систему этих 2-ух уравнений-из 1 уже у нас есть x=5y-4,подставляем этот икс во 2 уравнение:7y-2=2(5y-4)решаем,находим y. Получаем,что y=2.
ОТВЕТ: при y=2 значение выражения 7y-2 больше значения выражения 5y-4 в 2 раза.

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