(2/x)-(1/y)=4

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Solution for (2/x)-(1/y)=4 equation: 


D( x )

x = 0

x = 0

x = 0

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

2/x-(1/y) = 4 // - 4

2/x-(1/y)-4 = 0

2/x-y^-1-4 = 0

2*x^-1 = -(-y^-1-4) // : 2

x^-1 = (y^-1+4)/2

-1 < 0

1/(x^1) = (y^-1+4)/2 // * x^1

1 = x^1*((y^-1+4)/2) // : (y^-1+4)/2

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

x = 2*(y^-1+4)^-1

x = 2*(y^-1+4)^-1

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