Answer:
y - 2x = 12 and x - 2y = -18

The ones that are correct B, C, and E
The top left is the correct answer, because the sides are parallel.
Hope this helps!
16m cubed - 10m squared......
take out the common factors
they both have a two that can go into it and both have two m's you can take out
so then it becomes
2m squared(8m-5) and thats your answer (: