book Maths Puzzle Numerical Ability

what is the soultion to this simultaneous equation using substion or addtion method
x+2y=15
x-2y=-9

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Okay I need major help on this question. I need to apply the quadratic formula to this equation bx^2-cx+a^2=0 my problem is i don't know how to apply the formula with two square ro A circular pond has a diameter of 2.5 meters. The owner wants to put a concrete walkway around the pool that has uniform width. She has enough to cover 5m(squared). What is the maximum width her walkway can be?