It's just a word-description of the process of adding two negative numbers.It's really easy to do. Just add the two numbers and write the answer witha negative sign.
It becomes less negativeTo explain. Lets take a negative, eg -5.If we decrease it by 1, it becomes -6 (where 1 is positive)Thus if we decrease it by -1, it becomes -4 (as the -1 is negative)Note that...