book Maths Puzzle Numerical Ability

I need help finding the answer for 3X=-2Y+13 and 2X+5Y=16 using elimination.
I don't know how to convert it so I can use elimination on the problem.

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book Other Question

What is 3g^2+g+1 factored. The area of a triangular plate is 16cm^2. If the base is 1cm longer than the height, what are the lengths of its base and height?
I am really unsure how to tackle this question.