exam Maths Puzzle Numerical Ability

Could I havehelp with this problem please* Find an equation of variation for the given situation. y varies inversely as the square of x, and y=6 when x=3

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exam Other Question

Perform the indicated operations:

(5x^2 - 3x = 2) + (-3x^2 - 5x - 8) - (x^2 - 3x - 10)
2x-y=8
I know how to do it but i get confused with the negative sign.
HELP PLEASE!