\[\boxed{\text{485\ (485).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[Работа\ по\ рисунку\ 61.\]
\[\textbf{а)}\ если\ \ x = 1,4 \Longrightarrow \text{\ \ \ }y \approx 2;\ \]
\[если\ \ x = - 2,6 \Longrightarrow \ y \approx 6,7;\]
\[если\ \ x = 3,1 \Longrightarrow \text{\ \ }y \approx 9,6.\]
\[\textbf{б)}\ если\ \ y = 4 \Longrightarrow \ \ x = 2\ \ и\ \ \ \]
\[x = - 2;\]
\[если\ \ y = 6 \Longrightarrow \ \ x \approx 2,4\ \ и\ \ \ \]
\[x \approx - 2,4.\]
\[\textbf{в)}\ y < 4 \Longrightarrow \ \ при\ \ x = 1,2\ \ \ и\ \ \]
\[x = 0;\]
\[y > 4 \Longrightarrow \ \ при\ \ x = - 3\ \ \ и\ \ \ \]
\[x = 2,5.\]