Question

Реши методом алгебраического сложения систему уравнений. {8y−7x=−88y+x=2Ответ:(при необходимости ответ округли до десятитысячных!)x=;y=.​ Смотреть ответ poznjakveronik poznjakveronik         { 8y−7x=−8  __            {8y+x=2        (8y-7x)-(8y+x)=-8-2        -8x=-10         x=1,25        8(5/4)-7x=-8        y=3/32       Ответ:x=1,25;y=3/32 Новые вопросы в Математика Помогите пожалуйста!!!!!!!! Тато, мама, син та донька вирішили купити квартиру для доньки. Тато вніс половину того, що внесли інші троє, мама внесла третину від суми, що внесли і … нші трос, а син вніс чверть того, що внесли інші троє. Донька внесла решту 13000 умовних одиниць. Скільки коштує квартира, Тупий кут ромба дорівнює 120° градусів з вершини цього кута проведено висоту яка відтинає від сторони відрізок 2 сантиметри знайдіть периметр ромба і … довжину меншої з діагоналей СРОЧНООООО Познач числа на координатному промені. 0 , 5 52 1 , 3 1 54 2 12 2 , 7 0 , 7 2 , 5 помогите. и распишите по действиям как вы решили ​ 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

Давайте решимо данную систему уравнений методом алгебраического сложения:

Система уравнений:

1. $8y - 7x = -8$
2. $8y + x = 2$

Давайте начнем с уравнения (2) и выразим $x$: $x = 2 - 8y$

Теперь подставим это значение $x$ в уравнение (1): $8y - 7(2 - 8y) = -8$ $8y - 14 + 56y = -8$ $64y = 6$ $y = \frac{3}{32}$

Теперь, используя найденное значение $y$, подставим его в уравнение (2) для нахождения $x$: $8\left(\frac{3}{32}\right) + x = 2$ $\frac{3}{4} + x = 2$ $x = \frac{5}{4} = 1.25$

Итак, решение системы уравнений: $x = 1.25$ $y = \frac{3}{32}$

Ответ, округленный до десятитысячных: $x \approx 1.2500$ $y \approx 0.0938$

Теперь перейдем к вопросу о стоимости квартиры:

Пусть $C$ - стоимость квартиры. Заодно, обозначим взносы остальных членов семьи: $T$ - взнос тато, $M$ - взнос мама, $S$ - взнос син.

Из условия:

$T = \frac{1}{2}C$

$M = \frac{1}{3}C$

$S = \frac{1}{4}C$

Донька внесла остаток, то есть: $D = C - (T + M + S)$

Также известно, что $D = 13000$.

Подставим известные значения:

$13000 = C - \left(\frac{1}{2}C + \frac{1}{3}C + \frac{1}{4}C\right)$ $13000 = C - \frac{13}{12}C$ $\frac{1}{12}C = 13000$ $C = 12 \times 13000$ $C = 156000$

Таким образом, стоимость квартиры составляет 156000 умовных одиниц.