\[\boxed{\text{484\ (484).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ y \geq x\]
\[\textbf{б)}\ y \leq x - 1\]
\[\textbf{в)}\ y > \frac{1}{2}x - 1\]
\[\textbf{г)}\ y < \frac{1}{3}x - 3\]
\[\boxed{\text{484.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ x² + y² - 2x - 4y + 5 \Longrightarrow\]
\[\Longrightarrow (x - 1)^{2} + (y - 2)^{2} = 0 \Longrightarrow\]
\[\Longrightarrow x = 1,\ \ y = 2.\]
\[\textbf{б)}\ y² - x^{4} = 0 \Longrightarrow\]
\[\Longrightarrow (y - x²)(y + x^{2}) = 0\]