To find the slope of line \( m \) that goes through points \( A(15, -2) \) and \( B(-5, 2) \), we can use the slope formula:
\[ \text{slope} (m) = \frac{y_2 - y_1}{x_2 - x_1} \]
Let's assign the points:
- \( A = (x_1, y_1) = (15, -2) \)
- \( B = (x_2, y_2) = (-5, 2) \)
Now substitute the coordinates into the slope formula:
\[ m = \frac{2 - (-2)}{-5 - 15} \] \[ m = \frac{2 + 2}{-5 - 15} \] \[ m = \frac{4}{-20} \] \[ m = -\frac{1}{5} \]
Therefore, the slope of line \( m \) is
\[ \boxed{-\frac{1}{5}} \]