\[y = kx + b;\ \]
\[A( - 2;\ - 1):\]
\[- 1 = - 2k + b\]
\[b = 2k - 1.\]
\[B(3;1):\]
\[1 = 3k + b\]
\[b = 1 - 3k.\]
\[2k - 1 = 1 - 3k\]
\[5k = 2\]
\[k = 0,4.\]
\[b = 2 \cdot 0,4 - 1 = - 0,2.\]
\[Уравнение\ прямой:\]
\[y = 0,4x - 0,2.\]