Kylie is ordering a taxi from an online taxi service. She has to pay a flat charge just to order the taxi, and then has to pay per mile, depending on how far she travels. She wrote an equation to represent her total cost, y = 3.5+ 2.3x, where y represents the total cost in dollars and cents, and a represents the number of miles she travels. What could the number 3.5 represent in the equation? How much the taxi costs per mile. The total charge for 1 mile. The flat charge to order the taxi. How far Kylie can ride for $1.