Please help i will give brainlest Erin buys gas at a gas station for $4 a gallon. There is a sale going on at the gas station so that anyone who buys more than 5 gallons of gas only has to pay $3 a gallon for each gallon over 5 gallons. If a person buys more than 10 gallons of gas, each gallon over 10 gallons is only $2 a gallon for every gallon over 10 gallons but less than or equal to 15 gallons.. Erin's tank holds 12 gallons of gas.

a) Graph the function for the price of each gallon. The x-axis is the number of gallons and the y-axis is how much each gallon will cost.
(Hint: This will be a step function.)