Well you have to first find the constant of Brand X which would be 2.70/10 = .27. Brand Y is .4 more so that would be .31 per ounce. So then .31 x 11 = 3.41. The cost of 11 ounces of brand Y is $3.41.
I recommend that you download photomath, it is an app that takes a photo of the equation and answers it most of the time.
The answer is: c you should know that it's easy
Collect like terms:
(7x+4x)−2y
Simplify:
11x-2y
