exam Maths Puzzle Numerical Ability

I need to factor this problem.

8x^3y^2 - 18xy^4

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Now I have this problem:
solve the system by addition.
2x-4y=7
4x+2y=9
Ok so I subtract 2x-4x and get -2x
then I do -4y+2y=-2y
Now my problem looks like this;
-2x+-2y=7+9=
-2x+-2y=16
Now what? Find the product of the cube of (-4/3) and square of (-3/2).

Would i go about this like this:

(-4/3)*(-4/3)*(-4/3)*(-4/3)

(-3/2)*(-3/2)

Is this correct?