Brand X costs $1.65 for 11 ounces. Brand Y costs 2 cents more per ounce. What is the cost of 15 ounces of brand Y?

$2.55

First, we must find out the price for each ounce for Brand X by dividing 1.65 and 11. By doing this, we find out that each ounce costs $.15 (15 cents). If Brand Y costs 2 cents more than Brand X, we can add that to the $.15 of Brand X. This means that Brand Y costs $.17 (17 cents). Now, we must figure out how much money 15 ounces would cost by multiplying 15 and .17, which would equal 2.55. This is total cost of 15 ounces with Brand Y.

the solution is 12x-6y