The total payment \( y \) for the food delivery based on the number of miles \( x \) is calculated by adding the service fee and the fee per mile.
The service fee is $4.99, and the company charges $0.09 for each mile driven.
Therefore, the equation representing the total payment \( y \) as a function of the number of miles \( x \) is:
\[ y = 0.09x + 4.99 \]
This matches with the last response you've provided. So, the correct equation is:
y = 0.09x + 4.99.