(a) If x : y = 3 : 4 , then find the v...

(a) If ` x : y = 3 : 4 `, then find the value of the ratio `(2x + y) : ( 9x - 2y)`.
(b) If ` x : y = 5 : 4`, then find the value of the ratio ` (x^(2) + xy) : (x^(2) - xy)`.

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