Joe rented a truck. When he began driving the truck, it had 42,358 miles on it. After driving for 4 hours, the truck had 42,602 miles on it. Which equation represents the number of miles on the truck after Joe drove the truck for x hours?
y = 61x + 42,358
y = 42,358x + 61
y = 61x + 42,602
y = 42,602x + 61