Yak Travel Agency arranges trips for climbing Mount Everest. For each trip, they charge an initial fee in addition to \$0.15$0.15dollar sign, 0, point, 15 for each vertical meter climbed. For instance, the price for climbing all the way to the summit, which is 350035003500 meters above the base of the mountain, is \$645$645dollar sign, 645. Let yyy represent the fee (in dollars) of a trip where they climbed xxx vertical meters.
Complete the equation for the relationship between the fee and vertical distance.