exam Maths Puzzle Numerical Ability

Solve by using addition method. If no solution or infinite number of solutions,state so, and use set notation to express solution sets.

5x-2y=8
3x-5y=1

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exam Other Question

I am having problems figuring out how to solve this problem:
The volume of a cube is given by V = s3. Find the length of a side of a cube if the Volume is 729 cm3.
Thanks! Here is my problem: Twice what number is equal to three times that number? Thank you Lisa