exam Maths Puzzle Numerical Ability

x+y=8
2x-3y=1

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exam Other Question

writing to the simplest form can someone check this for me please!

-15x^3y^3
over
-20xy^4

= 3*5*x*x*x*y*y*y
over
2*2*5*x*y*y*y*y
=3x^2
over
4y Can you help me find GCF of the following product.

(6y^2 - 3y)(y + 7)

Thank you so much for your time.