exam Maths Puzzle Numerical Ability

2x+y=5
3x-y=3

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exam Other Question

Simplify the expression. Write answer with positive exponents. Assume that all variabls reperesent positive real numbers. -25^-2/3 Please help!

(y^2-36/y^2-4) X (y^2+6y+8)/(y^2-2y-24)