Given:
There are given that x is the price before the increase and y are the after the increased price.
Step-by-step explanation:
According to the question:
There are also given that 15% increase in their price.
So,
For the new price:

Then,

Now,
y is the price after the increase,
So,
The price equation of the new price is:

Final answer:
Hence, the correct option is A and C, and E.