Answer:
Step-by-step explanation:
According to the problem, the initial condition is $200. If he owed $100 after 4 weeks, that means he paid $25 per week, so that would be the constant ratio. Therefore, the expression would be:
Where represents the amount owed, and
represents weeks.
So, in the 4 week, that is, he owed:
As you can observe, the relation we found first perfectly to the problem. So, the final expression that model this problem is