Arco charges a flat rate of 035 with the purchase of prepaid

Arco charges a flat rate of $0.35 with the purchase of prepaid fuel using a debit/credit card. The total amount paid, y, increases with the amount of gallons of fuel purchased, x, multiplied by the cost of a gallon of fuel that day plus the flat rate charge of using a debit/credit card. Monday the cost per gallon was $2.50 and Kenny purchased 15 gallons of fuel. Wednesday the cost per gallon went up to $2.75 and Kenny this time purchased 13 gallons of fuel.

Solution

y = 15*2.5 +0.35 on monday

y = 37.5 +0.35

y=37.85

on wednus day

y = 13*2.75 +0.35

y =36.1