\[\left\{ \begin{matrix} 6x - 4y = b \\ 3x - 2y = 5 \\ \end{matrix} \right.\ \]
\[\frac{6}{3} = \frac{- 4}{- 2} eq \frac{b}{5}\]
\[2 = 2 eq \frac{b}{5}\]
\[\frac{b}{5} eq 2\]
\[b eq 10\]
\[Ответ:b eq 10.\]