If log x + log y = log (x+y), then,
Choose the correct choice: A) x=y B) xy=1 C) y= (x-1)/x D) y=x/(x-1) E) y=1/(x-1)
log x + log y = log (x+y)   =&gt; log (x+y) = log (xy)   =&gt; x+y = xy =&gt; y(x-1) = x   =&gt; y= x/(x-1)   ANSWER:y=x/(x-1)
<result>D</result>
If log x + log y = log (x+y), then,