if you owe your friend $10 and you pay them back $10 which points on the number line show how much amount of money changed
If you owe your friend $10 and you pay them back $10, the amount of money changed is zero. It means there is no change in the amount owed, and you have cleared your debt.
On the number line, the point representing the amount of money owed would be at $10, and the point representing the amount of money received would also be at $10. Thus, there is no net change and both points would overlap.