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xy=36 and x+y=-13
From first equation, if x is not equal to 0, y=36/x
then x+y = x + 36/x = -13
then x2 +36 = -13x or x2 +13 x + 36 =0
Delta = (132) - 4 x 1 x 36 = 25 = 52
So x=(-13±sqrt(25))/2=(-13±5)/2 so x=-4 or x=-9
As y=36/x then y=-9 or y=-4
The solutions are (x=-4,y=-9) or (x=-9,y=-4)
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