To find the slope of the line that passes through the points \( (0, 0) \) and \( (4, 3) \), we use the slope formula:
\[ m = \frac{y_2 - y_1}{x_2 - x_1} \]
Assigning the points as follows:
- \( (x_1, y_1) = (0, 0) \)
- \( (x_2, y_2) = (4, 3) \)
Now substitute the values into the formula:
\[ m = \frac{3 - 0}{4 - 0} = \frac{3}{4} \]
Thus, the slope of the line is
\[ \boxed{\frac{3}{4}} \]