book Maths Puzzle Numerical Ability

This question is actually about elimination because there werent any catorgories for elimination. My question is:
5x-4y=1
7x+4y=11

Thanks for the help!

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book Other Question

Could you please assist me with this problem:

(16x^2 + 8)(x-2)/(x-2)
Simplify by rationalizing the denominator:
(/11-/5)
________
(/11+5)