Answer:
It depends how you are subtracting...
Explanation:
If you are subtracting like this; -30-20....it is basically addition but backwards. So what I would do is first add the two numbers and then add a negative symbol.
However, if I am solving a problem like this:
-30-(-40)...I would convert it into
-30+40
because when ever you have 2 negatives...they become a positive! So now I know that my answer would be 10 because if you rearrange it...you would get,
40-30=?
This is how you subtract negatives!