Let's solve each equation step by step.
(a) \(-3 - (-6) = -3 + \text{blank}\)
When subtracting a negative number, it is equivalent to adding the positive version of that number:
\[ -3 - (-6) = -3 + 6 \]
Now, we calculate:
\[ -3 + 6 = 3 \]
So,
\[ -3 - (-6) = 3 \]
This means we can fill in:
\[ \text{blank} = 6 \]
(b) \(-4 - 2 = -4 + \text{blank}\)
We can directly calculate \(-4 - 2\):
\[ -4 - 2 = -6 \]
Now, we need to express \(-6\) in terms of \(-4\):
\[ -4 + \text{blank} = -6 \]
To find the blank, we can rearrange this:
\[ \text{blank} = -6 + 4 = -2 \]
Thus, we can fill in:
\[ \text{blank} = -2 \]
So the final answers are: (a) \(6\) and (b) \(-2\).