Предмет: Алгебра, автор: helper1390

СРОЧНО! РЕШИТЕ ПЖ ЗАДАНИЕ:

Приложения:

Ответы

Автор ответа: iwme
1

{ 2(3х - у) - 5 = 2х - 3у

{ 5 - (х - 2у) = 4у + 16

Раскрываем скобки

{ 6х - 2у - 5 = 2х - 3у

{ 5 - х + 2у = 4у + 16

Переносим числа в одну, а переменные в другую сторону

{ 6х - 2у - 2х + 3у = 5

{ - х + 2у - 4у = - 5 + 16

Упрощаем

{ 4х + у = 5 | · 2

{ - х - 2у = 11

{ 8х + 2у = 10

{ - х - 2у = 11

+ 2у и - 2у взаимно уничтожаются.

Составим уравнение

8х - х = 10 + 11

7х = 21

х = 21 : 7

х = 3

Подставим значение х в любое уравнение

- 3 - 2у = 11

- 2у = 11 + 3

- 2у = 14

у = 14 : (- 2)

у = - 7

Ответ : (3; - 7)


helper1390: СПАСИБО ВАМ ЕЩЁ РАЗ!
iwme: да не за что, обращайтесь.)
helper1390: ;)
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