solving equation L = E / r + (R / N) for N

[Boberto96]

L=E/r+(R/N)

i have made no progress on this question whatsoever. can someone help me solve for N please?

thanks.

 

[mmm4444bot]

Re: solving for N

Hi Boberto:

Did you try anything? Sometimes, you learn by experimenting. Did you try any operations to both sides of this equation just to see what happens?

Since the variable N is in the denominator of a fraction, you will eventually need to multiply both sides of the equation by N (this is the only way to get a variable for which you are solving out of the denominator).

However, you can save yourself a little work if you wait to multiply both sides by N.

First, get the term R/N (i.e., the term that contains N) all by itself on one side of the equal sign before multiplying.

Let us know if you need more help on this exercise; next time, please post whatever work you've been able to try.

Cheers,

~ Mark

 

[Denis]

Re: solving for N

Just another way (the one I prefer); after Mark's suggestion to get the R/N by itself, you have:
R/N = L - E/r ; then:
R/N = (Lr - E)/r ; now crisscross multiply :
N(Lr - E) = Rr
I'll let you finish it.