y=-9x/x^2+4

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Solution for y=-9x/x^2+4 equation: 


D( x )

x^2 = 0

x^2 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

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

y = (-9*x)/(x^2)+4 // - (-9*x)/(x^2)+4

y-((-9*x)/(x^2))-4 = 0

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

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

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

-1 < 0

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

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

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

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

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

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