7/y=4/x

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Solution for 7/y=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/y = 4/x // - 4/x

7/y-(4/x) = 0

7/y-4*x^-1 = 0

-4*x^-1 = -(7*y^-1) // : -4

x^-1 = (-7*y^-1)/(-4)

-1 < 0

1/(x^1) = (-7*y^-1)/(-4) // * x^1

1 = x^1*((-7*y^-1)/(-4)) // : (-7*y^-1)/(-4)

(4*y)/7 = x^1

x = (4*y)/7

x = (4*y)/7

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