Решебник по алгебре 7 класс Мерзляк ФГОС Задание 1050

 

\[\boxed{\text{1050\ (1050).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[Ответ:(1;2).\]

\[\left\{ \begin{matrix} y = - 1\ \ \ \ \ \ \ \\ x = \frac{13 - 7}{2} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} y = - 1 \\ x = 3\ \ \ \ \\ \end{matrix} \right.\ \]

\[Ответ:(3;\ - 1).\]

\[\left\{ \begin{matrix} x = 4\ \ \ \ \ \ \ \ \ \ \ \ \\ y = \frac{38 - 32}{3} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} x = 4 \\ y = 2 \\ \end{matrix} \right.\ \]

\[Ответ:(4;2).\]

\[\left\{ \begin{matrix} y = 5\ \ \ \ \ \ \ \ \ \ \ \ \ \\ x = \frac{10 + 4y}{5} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} y = 5 \\ x = 6 \\ \end{matrix} \right.\ \]

\[Ответ:(6;5).\]

\[\left\{ \begin{matrix} b = 0,5\ \ \ \ \ \ \ \ \\ a = \frac{2 + 2,5}{3} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} b = 0,5 \\ a = 1,5 \\ \end{matrix} \right.\ \]

\[Ответ:(1,5;0,5).\]

\[Ответ:(1;\ - 1)\text{.\ }\]

\[\boxed{\text{1050.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[1)\ y( - 4) = - 2 \cdot ( - 4) + 5 =\]

\[= 8 + 5 = 13\]

\[y(3,5) = - 2 \cdot 3,5 + 5 =\]

\[= - 7 + 5 = - 2\]

\[y(0) = 0 + 5 = 5\]

\[2)\ при\ y = 9:\ \ \]

\[- 2x + 5 = 9\]

\[- 2x = 4\ \]

\[x = - 2.\]

\[при\ y = - 5:\ \]

\[\ - 2x + 5 = - 5\ \]

\[- 2x = - 10\ \]

\[\ x = 5.\]

\[y = 0:\ \]

\[\ - 2x + 5 = 0\ \]

\[- 2x = - 5\]

\[\ x = 2,5.\]