book Maths Puzzle Numerical Ability

how do you use elimination to solve for the x and the y
11x - 5y = 80
9x - 15y = 120

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book Other Question

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? I am not sure what to do.

(a) What is the sum of the roots of the equation ax squared + bX + c = 0
(b) What is the product of its roots?