Tim’s mom filled the gas tank in her SUV and spent $72.00 for 22.5 gallons of unleaded gasoline. What is the constant of proportionality that relates the cost in dollars, y, to the number gallons of unleaded gasoline, x? *
1 point
$0.31 per gallon of unleaded gas
$3.13 per gallon of unleaded gas
$3.20 per gallon of unleaded gas
$0.32 per gallon of unleaded gas
