Explanation:
To find the constant of proportionality that describes the relationship between the hours of babysitting and the amount paid, we can calculate the hourly rate for Savannah.
1) For the first scenario, she was paid $87 for 12 hours, so the hourly rate is $87 divided by 12, which is $7.25 per hour.
2) For the second scenario, she was paid $65.25 for 9 hours, so the hourly rate is $65.25 divided by 9, which is $7.25 per hour as well.
Since the hourly rate is the same in both scenarios, the constant of proportionality that describes this relationship is $7.25 per hour.