\[\boxed{\mathbf{204}\text{.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[График\ проходит\ через\ точку\ \]
\[\text{M\ }(1;2):\]
\[2 = a + b - 18.\]
\[График\ проходит\ через\ точку\ \]
\[\text{N\ }(2;10):\]
\[10 = 4a + 2b - 18.\]
\[\left\{ \begin{matrix} 2 = a + b - 18\ \ \ \ \ \ \\ 10 = 4a + 2b - 18 \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} a + b = 20\ \ \ \ \ \\ 4a + 2b = 28 \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} a = 20 - b\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 4 \cdot (20 - b) + 2b = 28 \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} a = 20 - b\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 80 - 4b + 2b = 28 \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} a = 20 - b \\ 2b = 52\ \ \ \ \ \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} a = 20 - b \\ b = 26\ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} a = 20 - 26 = - 6 \\ b = 26\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix}. \right.\ \]
\(Ответ:при\ a = - 6;\ \ b = 26.\)