Question

Помогите систем уравн

Answer 1

Ответ:

1. (-2; -1)

2.(-24; -108)

Пошаговое объяснение:

$\[\begin{array}{l}1.\\\left\{ \begin{array}{l}3x = y - 5\\4x - 3y = - 5\end{array} \right.\, < = > \left\{ \begin{array}{l}3x + 5 = y\\4x - 3(3x + 5) = - 5\end{array} \right.\\4x - 3(3x + 5) = - 5\\4x - 9x - 15 = - 5\\ - 5x = 10\\x = - 2\\y = 3 \cdot ( - 2) + 5 = - 6 + 5 = - 1\\(x;y) = ( - 2; - 1)\end{array}\]$

$\[\begin{array}{l}2.\\\left\{ \begin{array}{l}7x + 15 - y = - 45\\4x - 3 - y = 9\end{array} \right. < = > \left\{ \begin{array}{l}7x + 15 + 45 = y\\4x - 3 - (7x + 15 + 45) = 9\end{array} \right.\\4x - 3 - (7x + 15 + 45) = 9\\4x - 3 - 7x - 15 - 45 = 9\\ - 3x = 72\\x = - 24\\y = 7 \cdot ( - 24) + 15 + 45 = - 108\\(x;y) = ( - 24; - 108)\end{array}\]$

Answer 2

Ответ:

(-24;-108)

Пошаговое объяснение: