Given x ^ 2 + y ^ 2-6x-8y + 25 = 0, find y / x-x / y

(x-6x+9)+(y²-8y+16)=0
(x-3)²+(y-4)²=0
So x-3 = 0, y-4 = 0
x=3,y=4
So the original formula = 4 / 3-3 / 4 = 7 / 12

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