# Завдання 9

### 9.1

Розв’яжи рiвняння графiчним методом:

а)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-3x-5y& =-30\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x-5y& =-10\hfill \end{array}$
б)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x-4y& =-8\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x+y& =-7\hfill \end{array}$
в)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x-y& =-7\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x+y& =-1\hfill \end{array}$
г)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x+y& =4\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}x+y& =4\hfill \end{array}$

### 9.2)

Розв’яжи рiвняння методом пiдстановки:

а)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x-5y& =-30\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x+y& =-6\hfill \end{array}$
б)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x-y& =-4\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-6x+y& =-38\hfill \end{array}$
в)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}3x-2y& =18\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}x+y& =16\hfill \end{array}$
г)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}2x-y& =-3\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}3x+y& =18\hfill \end{array}$

### 9.3)

Розв’яжи рiвняння методом додавання:

а)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x-3y& =-23\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}x+y& =-3\hfill \end{array}$
б)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x+y& =-1\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-3x+y& =-7\hfill \end{array}$
в)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-2x+y& =-6\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x-3y& =-17\hfill \end{array}$
г)
$\begin{array}{ccc}\hfill I\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}-x+y& =4\hfill & \hfill \\ \hfill II\phantom{\rule{0.22em}{0ex}}\phantom{\rule{0.22em}{0ex}}x+9y& =46\hfill \end{array}$

З розв’язками завдань можна ознайомитися тут.

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