Divide:

-2 by $-\dfrac{1}{2}$

$-2 ÷ -\dfrac{1}{2}\\[1em] = -2 \times -\dfrac{2}{1}\\[1em] = \dfrac{2 \times 2}{1 \times 1}\\[1em] = \dfrac{4}{1}\\[1em] = 4$

Hence, $-2 ÷ -\dfrac{1}{2} = 4$