i just need to know how to add a negitive to a positive. like 5 + -9. any help?
-9 | | | | -4 | | | 0 | | | | 5
You either start at 5 and move 9 steps backwards, or, start at -9 and move 5 steps forwards.
Either way, you end up at 4.
Backwards motion is to the left, occuring with negative numbers, where forwards motion is moving to the right, occuring with positive numbers.