Candace purchased 6 gallons of gas for $13.56. What is the constant of proportionality that relates the cost in dollars, y, to the number of gallons, x?
A. $1.23 per gallon
B. $2.26 per gallon
C. $0.44 per gallon
D. $3.04 per gallon
To find the constant of proportionality, we need to divide the cost by the number of gallons:
Constant of proportionality = $13.56 / 6 gallons = $2.26 per gallon
Therefore, the correct answer is B. $2.26 per gallon.