To find the slope \( m \) of a line that passes through the points \((x_1, y_1) = (-10, -1)\) and \((x_2, y_2) = (5, -4)\), we use the formula for the slope:
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
Substituting in the coordinates of the points:
\[ m = \frac{-4 - (-1)}{5 - (-10)} = \frac{-4 + 1}{5 + 10} = \frac{-3}{15} = -\frac{1}{5} \]
Thus, the slope of the line is:
\[ -\frac{1}{5} \]
So the correct response is:
−15 (negative 1 fifth).