Negative numbers represent values below zero and positive numbers represent values above zero.
4+ (-2)= (-1) Is an addition statement.
3- (-1)= 4 Is a subtraction statement.
Opposite integers have the same numeral but different sign.
Eg. (+3) and (-3)
If you need help understanding how to do this, I would suggest you use integer chips or a number line. It helps me when I get stuck. I hope it helps you too! :)