# Thread: algebraic equation help

1. ## algebraic equation help

I'm told that (R = v/f*L) is the same thing as (L = v/f*r) but I can't seem to get there algebraiclaly. If anyone can show me all the steps I'd be very appreciative.

2. ## Re: algebraic equation help

Originally Posted by willowthewisp
I'm told that (R = v/f*L) is the same thing as (L = v/f*r) but I can't seem to get there algebraiclaly. If anyone can show me all the steps I'd be very appreciative.
Use brackets where they're needed please. Is it \displaystyle \displaystyle \begin{align*} R = \frac{v}{f\cdot L} \end{align*} or \displaystyle \displaystyle \begin{align*} R = \frac{v}{f}\cdot L \end{align*}? What you wrote implies the latter...

3. ## Re: algebraic equation help

I'm sorry. It is the former.

4. ## Re: algebraic equation help

\displaystyle \displaystyle \begin{align*} R &= \frac{v}{f \cdot L} \\ R \cdot f \cdot L &= v \\ L &= \frac{v}{R \cdot f} \end{align*}

5. ## Re: algebraic equation help

thanks very much.