exam Maths Puzzle Numerical Ability

what is the solution set for the system

9x-12y=1 and -3x+4y=27

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exam Other Question

For all x>0 and y>0, the radical expression: square root of 3 divided by 3 times the square root of x minus the square root of y. how could I find general term in sequence not for (arthematic or geometric only) thank you