Problem
Mr. Shand has a balance of - $79.98 in his bank account. He then makes a deposit of $31.05. Create a number line to represent this transaction and determine the new balance in Mr. Shand's bank account.
Solution
For this case the new balance can be founded on this way:
NB = -79.98 + 31.05= -48.93
And that's explaind in the following image: