The slope of a line whose inclination is 30°, is:

1. $\dfrac{1}{2}$

2. $\sqrt{3}$

3. 1

4. $\dfrac{1}{\sqrt{3}}$

The slope (m) of a line is related to its inclination (θ) by the formula:

m = tan θ

m = tan 30° = $\dfrac{1}{\sqrt3}$.

Hence, option 4 is the correct option.