Which linear relationship is modeled by the cost function f(x) = 8x +3with representing the number of tours? The cost of renting a bicycle is S8 per hour plus 3 for helmet rental The cost of renting a bicycle is $8 plus S3 for helmet rental The cost of renting a bicycle is $8 for helmet rental plus $3 per hour. The cost of renting a bicycle is $8 per hour for the bicycle and 53 per hour for the helmet.​