exam Maths Puzzle Numerical Ability

My question is can you help me solve this equation? This problem is a Substition.

x+2y=13
3x-5y=6

I do not understand how to find x and y for this equation. If you could help it would be great. Thank you.

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exam Other Question

Is sqrt (x^2) = x an identity (true for all values of x)?

Explain your answer Have I rounded this correctly. I am supposed to round to the nearest tenth. The number is 75.982 I have 76.0. is this correct? This gets confusing for me and I thank you for your time and help.