At a carnival, single rides cost $2 each, and all-day ride passes cost $15. The total revenue for the day was $2960. Which equation can be used to represent x as the number of single ride passes sold and y as the number of all-day ride passes?
a) $2x + $15y = $2960
b) $15x + $2y = $2960
c) $17x + $13y = $2960
d) $13x + $17y = $2960
