SOLUTION: Solve the following: I = E/R + r for r I understand how to do this if there was not a "+ r" in the equation, but I am lost when it comes to the "+ r". I don't know what

Question 10329: Solve the following:

I = E/R + r for r

I understand how to do this if there was not a "+ r" in the equation, but I am lost when it comes to the "+ r". I don't know what you do with it. I think it would turn into a "1r".

I = E/r, then multiply both sides by r,and end up with the answer: E/I = r?

Please let me know if this is correct, of if I am at least on the right track. Thanks for your help.
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Do you mean , solve for r?? If this is what you meant, then you needed parentheses around the (R+r). If that is NOT what you meant, then the solution is quite different from what I am about to do--resubmit the problem, we'll take another look at it. Also, remember that
in math, capital R and lower case r are considered two different variables!

Assuming this is the problem you had in mind:
. Remember ? It means .

In the same way, means that

Remove parentheses:
IR + Ir = E

Get the small r term all alone on the left side by subtracting IR from each side:
IR - IR + Ir = E - IR
Ir = E-IR

Last, divide both sides by I:

R^2 at SCC
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