Given the equation that represents the relationship between the number of months her parents have been saving and the amount in their account.
3200 is like the intercept and the amount already in the account based on the context of the problem.
The amount in the account is along the y axis of the line and since y intercept is the point where the line cuts the y axis and 3200 lies on the y axis hence 3200 will be the money already in the account.
