Yes x and y do have a proportional relationship because with every 10 copies of paper the value of y goes up by 1 meaning that it would have a constant rate of change equal to 1/10
To answer b - You need to find how much it costs to rent a bike per hour. To do this divide the over all cost ($12) by your amount of time (3 hrs) to get $4 per hour. Same with the $20 per 5 hours!
