Question

Решите систему уравнений {2x - y = 4 x + 2y = -13{ - система ​ Смотреть ответ IrkaShevko IrkaShevko Ответ: (-1; -6) Пошаговое объяснение: {2x - y = 4 {x + 2y = -13 {4x - 2y = 8 {x + 2y = -13 сложим уравнения: 4x - 2y + x + 2y = 8 - 13 5x = -5 x = -1 из первого уравнения: y = 2x - 4 = 2*(-1) - 4 = -2 - 4 = -6 Благодарю ✨ Новые вопросы в Математика Добуток яких двох цілих чисел не дорівнюють -18. ПОМОГИТЕ ПОЖАЛУЙСТА У чому різниця у залежності прямої та оберненої пропорційністю? Решите задачу и прокомментируйте свои действия: Используя взаимосвязь индексов, определите, на сколько процентов увеличились цены, если известно, что … товарооборот в фактических ценах возрос на 10%, а количество проданных товаров снизилось на 30%.​ 10. Делимое увеличили в 12 раз. Как надо изменить делитель, чтобы частное увеличилось в 4 раза? А) увеличить в 3 раза В) увеличить в 4 раза С) уменьш … ить в 3 раза D) уменьшить в 4 раза Е) увеличить в 8 раз потрібно до завтра зробити .дам 40 Порівняйте час, за який найшвидший бігун і найшвидший ковзаняр подолали марафонську дистанцію.​ Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Для решения системы уравнений {2x - y = 4, x + 2y = -13, нужно следовать определенным шагам:

Шаг 1: Мы можем устранить одну из переменных из одного из уравнений, чтобы решить систему методом сложения или вычитания. В данном случае, если умножить первое уравнение на 2, получим: 2(2x - y) = 2 * 4 4x - 2y = 8

Шаг 2: Теперь сложим полученное уравнение с вторым уравнением: (4x - 2y) + (x + 2y) = 8 - 13 5x = -5

Шаг 3: Разделим обе стороны на 5, чтобы найти значение переменной x: x = -1

Шаг 4: Подставим найденное значение x в одно из исходных уравнений, например, в первое: 2x - y = 4 2 * (-1) - y = 4 -2 - y = 4

Шаг 5: Теперь решим уравнение относительно y: -y = 4 + 2 -y = 6 y = -6

Таким образом, решение системы уравнений {2x - y = 4, x + 2y = -13 составляет x = -1 и y = -6.

По поводу других вопросов:

1. Добуток (произведение) двух целых чисел не может быть равен -18, так как произведение двух чисел с одинаковым знаком всегда положительно или ноль. А произведение чисел с разными знаками всегда отрицательно или ноль. Для получения отрицательного числа -18, одно из чисел должно быть положительным, а другое отрицательным. Таких чисел нет, так как 1 * (-18) = -18, а (-1) * 18 = -18.

2. Разница между прямой и обратной пропорциональностью заключается в том, как меняются значения двух переменных при изменении друг друга. В прямой пропорции, если одна переменная увеличивается, то другая тоже увеличивается, и наоборот, если одна уменьшается, то другая тоже уменьшается. В обратной пропорции, если одна переменная увеличивается, то другая уменьшается, и наоборот, если одна уменьшается, то другая увеличивается.

3. Для определения процентного изменения цены необходимо рассмотреть изменение товарооборота в фактических ценах и количество проданных товаров. Если товарооборот возрос на 10%, а количество проданных товаров снизилось на 30%, то можно рассчитать процентное изменение по формуле:

Процентное изменение = (Новое значение - Старое значение) / |Старое значение| * 100

Новое значение товарооборота = Старое значение товарооборота + 10% товарооборота Новое количество проданных товаров = Старое количество проданных товаров - 30% от количества проданных товаров

После вычисления новых значений, подставляем их в формулу процентного изменения, чтобы найти ответ.