\[\boxed{\text{62\ (62).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ x \leq 8\]
\[\textbf{б)}\ y \geq 0\]
\[\textbf{в)}\ 5 < a \leq 7\]
\[\textbf{г)} - 2 \leq b < 1\ \]