In the function \( y = 99x + 15 \), we can break it down as follows:
- \( y \): This represents the total cost in dollars.
- \( x \): This represents the number of months of service.
- \( 99 \): This is the monthly service charge in dollars. It indicates that for each month of service, the customer will pay an additional $99.
- \( 15 \): This is the one-time installation fee in dollars. It indicates that when a customer first subscribes, they need to pay $15 as an initial charge, regardless of how many months they continue to receive the service.
So, in summary:
- The \( 15 \) represents the one-time installation fee.
- The \( 99 \) represents the monthly service charge per month of service.