\[Дано:\ \ a > 4\ \ \ и\ \ b < - 3.\]
\[5b - a < - 19 \Longrightarrow верно.\]
\[b < - 3\ \ \ \ | \cdot 5\ \ \ \ \ - a < - 4\]
\[5b < - 15\]
\[+ \left| \begin{matrix} 5b < - 15 \\ - a < - 4\ \ \ \\ \end{matrix} \right.\ \]
\[\text{\ \ \ \ }\overline{5b - a < - 19}\]