exam Maths Puzzle Numerical Ability

4. thank you all so much for your invaluable help. I would like to SEE how I can FACTOR this problem, please help. Thank you!

5u^3 - 80uy^2

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exam Other Question

What would X and Y equal if:
-5x + 2y = -5

-5x + y = 0

I think y= 0
And x= 1

But im not sure if thats right or not.

Any help please? How do I simplify and write answer using positive exponents

(-x^8)^2y^4x^3x^0