3/y – 4 = y

(iv) ³/_y – 4 = y

Sol. ³/_y – 4 = y

Multiplying throughout by y, we get,

3 – 4y = y²

∴ – y² – 4y + 3 = 0

Changing the sign,

∴ y² + 4y – 3 = 0

Here a = 1, b =  4, c = - 3  are real numbers

where a ≠ 0

So it is a quadratic equation in variable y.