SOLUTION: solve for r S = a / (a - r) I know the answer but don't know how to get it

Question 227346: solve for r S = a / (a - r) I know the answer but don't know how to get it
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Solve for r.

Multiply both sides of the equation by the denominator (a-r).

Get the r term alone on the left side by subtracting Sa from each side:

Divide both sides by -S:

Multiply numerator and denominator by -1:
or or

You may want to take a look at my own website for my non-traditional explanation of the topic that I call "Literal Equations". Do a "Bing" or "Google" search for my last name "Rapalje". Look for "Rapalje Homepage" near the top of these searches. Then near the top of my Homepage, look for "Basic, Intermediate and College Algebra". Choose either Basic Algebra" Chapter 3", "Section 3.07". For a slightly more advanced explanation, see "Intermediate Algebra", "Chapter 2", "Section 2.07".

As to your specific problem that you posted, I don't think you gave enough information to solve it.

R^2

Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus

RELATED QUESTIONS
I know the solution but I don't know how to get there. R=r/1-t solve for... (answered by Simnepi)

Solve each equation for the variable indicated. 4=r t for t (here are the steps I did... (answered by Fombitz)

Find the sum of each of the following infinite series. If a series does not have a sum... (answered by rapaljer)

i need help with an (intermediate algerbra: Rational expressions) im not to sure how to... (answered by jim_thompson5910)

Please help me solve this equation: 1-r= -5 I tried it and i got this: 1-r =-5 -1 (answered by jim_thompson5910)

Solve the following: I = E/R + r for r I understand how to do this if there... (answered by rapaljer)

(a) Let f(x): (-inf, 0) U (0 inf) --> R be defined by f(x) = x- (1/x) Show that f(x) has (answered by ikleyn)

Simplify |-3+4 x-2| the answer key says 11 but i don't know how that's the... (answered by Solver92311,ikleyn)

Let L: R^2 -> R^2 be a linear operator. If L((1,2)^T)=(-2,3)^T and... (answered by khwang)