Question

1/y= 1/p+1/q

solve for y.

Answer 1

Is there something exactly that you don't understand...?

Answer 2

how to solve for y?

Answer 3

Okay

Answer 4

Bring both fractions on the right hand side (RHS) together by finding the common denominator and adding:
\[\frac{1}{y}=\frac{p+q}{pq}\]
Divide each side by one
\[1\div\frac{1}{y}=\frac{p+q}{pq}\div1\]
This results in each fraction being flipped and thus:
\[y=\frac{pq}{p+q}\]