Given the expression:
[tex]\text{ - 1 - 8}[/tex]In the rule of subtracting integers, when a negative integer is being subtracted by a number, that number will be added to the negative integer instead. We get,
[tex]\text{ -1 - 8 }\rightarrow\text{ -1 + (-8) = -9}[/tex]Rules in subtracting integers,
- subtracted by + = - plus the number in negative form = -x - y = - x + (-y)
- subtracted by - = - plus the number positive form = -x - (-y) = - x + y
+ subtracted by + = automatically subtract = x - y
+ subtracted by - = the operation will change into addition = x - (-y) = x + y
