d = (r/1+rt) solving for r
I just can't seem to solve for r on this one. I know this question is pretty simple, but I'm studying on my own so I can't ask my instructor.
Hi kingsolomonsgrave,
I'm not sure why you enclosed the right side of your equation in parentheses. And your right side is a bit ambiguous. Is it
$\displaystyle d=\frac{r}{1+rt}$
I'll assume it is and proceed from there.
First, multiply both sides of your equation by 1 + rt
$\displaystyle d+drt = r$
Next, transpose drt to the right side.
$\displaystyle d = r - drt$
Factor an r out of the right side.
$\displaystyle d = r(1-dt)$
Finally, divide both sides by 1 - dt
$\displaystyle \frac{d}{1-dt} = r$