2=42/y

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Solution for 2=42/y equation: 


D( y )

y = 0

y = 0

y = 0

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

2 = 42/y // - 42/y

2-(42/y) = 0

2-42*y^-1 = 0

-42*y^-1 = -2 // : -42

y^-1 = 1/21

-1 < 0

1/(y^1) = 1/21 // * y^1

1 = 1/21*y^1 // : 1/21

21 = y^1

y = 21

y = 21

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