\[y = kx + b;(3;0);(0; - 4)\]
\[(0; - 4):\]
\[0x + b = - 4\]
\[b = - 4;\]
\[(3;0):\]
\[3k - 4 = 0\]
\[3k = 4\]
\[k = \frac{4}{3} = 1\frac{1}{3}.\]
\[Формула:\]
\[y = 1\frac{1}{3}x - 4.\]