If (3x+2y-22)2 + (4x-5y+9)2 = 0 and 5x-4y = 0. Find the value of x+y.
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13
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2(3x+2y-22) + 2(4x-5y+9)=0
=> 2(3x+2y-22+4x-5y+9)=0
=> 7x-3y=13 -------------------(1)
5x-4y=0 --------------------(2)
(1) - (2)
=> 7x-3y=13
5x-4y=0
--------------------
2x+y=13
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