SOLUTION: Please help me solve the formula for the variable r: S=a/1-r

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Question 263514: Please help me solve the formula for the variable r: S=a/1-r
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
S=a%2F%281-r%29 Start with the given equation.


S%281-r%29=a Multiply both sides by 1-r.


S-Sr=a Distribute


-Sr=a-S Subtract S from both sides.


Sr=-a%2BS Multiply both sides by -1.


Sr=S-a Rearrange the terms.


r=%28S-a%29%2FS Divide both sides by S to isolate r.