exam Maths Puzzle Numerical Ability

Please help me solve this problem. It says to simplify:(3x^3y^-4)^3

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exam Other Question

I have to do a powerpoint by tomorrow that includes #28 (the proof) on pg. 219 in the upper right hand corner. I have the statements typed out already, but I need to know what the Use substitution or elimination to solve each system of equations. Please explain.

7. 2x + 5y=16
5x - 2y= 11