The point-slope form of the equation of a line is given by the formula:
\[ y - y_1 = m(x - x_1) \]
where \( m \) is the slope and \((x_1, y_1)\) is a point on the line.
Given that the slope \( m = \frac{1}{8} \) and the point \((x_1, y_1) = (9, 4)\), we can substitute these values into the point-slope formula:
\[ y - 4 = \frac{1}{8}(x - 9) \]
This is the equation of the line in point-slope form.