If x2 – 6xy + 9y2 = 0, then the value of y : x is:
x2 – 6xy + 9y2 = 0
Dividing whole equation by y2
(x/y)2 – 6x/y + 9 = 0
Let x/y be d
d2 – 6d + 9 = 0
d = 3
x ? y = 3 ? 1
y ? x = 1 ? 3
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