To create a formula for Carly's savings over time, we can define:
- \( Y \): the total amount of money Carly has saved after a certain number of weeks.
- \( x \): the number of weeks Carly babysits.
Since Carly receives $50 each week, the relationship between her savings and the number of weeks she babysits can be expressed as:
\[ Y = 50x \]
So, the complete formula for Carly's savings over time is:
\[ Y = 50x \]