Question

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Answer 1

$\dfrac{1 + \frac{1}{y}}{1 - \frac{1}{y}} =$

$= \dfrac{y}{y} \times \dfrac{1 + \frac{1}{y}}{1 - \frac{1}{y}}$

$= \dfrac{1 \times y + \frac{1}{y} \times y}{1 \times y- \frac{1}{y} \times y}$

$= \dfrac{y + 1}{y- 1}$

Answer:      B.      $\dfrac{y + 1}{y- 1}$