exam Maths Puzzle Numerical Ability

Horriable at fractions any help would be greatly appreciated. It is a fraction with the exponet being the 2/3 and 1/3.

(25x^3) 2/3
(125xy^2) 1/3

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exam Other Question

please, help me to answer the quastion: explain the difference between simplifying an expression and solving an equation. Solve each of these by graping. Thanks!!!

10. 2x-y=4
2x-y=6

12. x-2y=8
3x-2y=12

I appreciate your help!!!
McGraw Hill 6th edition, chapter 8.1