y=9/x

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Solution for y=9/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

y = 9/x // - 9/x

y-(9/x) = 0

y-9*x^-1 = 0

-9*x^-1 = -y // : -9

x^-1 = y/9

-1 < 0

1/(x^1) = y/9 // * x^1

1 = x^1*(y/9) // : y/9

9*y^-1 = x^1

x = 9*y^-1

x = 9*y^-1

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