\[\boxed{\text{1170.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ (x - 2)(y - 3) = 0\]
\[\left\lbrack \begin{matrix} x = 2 \\ y = 3 \\ \end{matrix} \right.\ \]
\[\textbf{б)}\ (x + 8)(y - 1) = 0\]
\[\left\lbrack \begin{matrix} x = - 8 \\ y = 1\ \ \ \\ \end{matrix} \right.\ \]
\[\textbf{в)}\ (x + 4)(y + 5) = 0\]
\[\left\lbrack \begin{matrix} x = - 4 \\ y = - 5 \\ \end{matrix} \right.\ \]
\[\textbf{г)}\ x \cdot (y - 2) = 0\]
\[\left\lbrack \begin{matrix} x = 0 \\ y = 2 \\ \end{matrix} \right.\ \]
\[x = 0 \Longrightarrow ось\ y.\]