y=9/x-4

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Solution for y=9/x-4 equation: 


D( x )

x = 0

x = 0

x = 0

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

y = 9/x-4 // - 9/x-4

y-(9/x)+4 = 0

y-9*x^-1+4 = 0

-9*x^-1 = -(y+4) // : -9

x^-1 = (y+4)/9

-1 < 0

1/(x^1) = (y+4)/9 // * x^1

1 = x^1*((y+4)/9) // : (y+4)/9

9*(y+4)^-1 = x^1

x = 9*(y+4)^-1

x = 9*(y+4)^-1

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