ANSWER:

To calculate the slope of the line between two points, use the slope formula:

$$\text{slope} = \frac{y_2 - y_1}{x_2 - x_1}$$

Given the points $(0, 0)$ and $(5, 2)$, substitute the coordinates into the formula:

$$\text{slope} = \frac{2 - 0}{5 - 0} = \frac{2}{5}$$

So, the slope of the line is $\frac{2}{5}$