\[y = kx + b;A(3; - 1);B(2;4):\]
\[\left\{ \begin{matrix} 3k + b = - 1 \\ 2k + b = 4\ \ \ \ \\ \end{matrix} \right.\ ( - )\]
\[k = - 5;\]
\[b = 4 - 2k = 4 + 10 = 14.\]
\[Уравнение\ прямой:\]
\[y = - 5x + 14.\]