SOLUTION: Solve the formula for the variable given. a = S − Sr; S

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Question 1072266: Solve the formula for the variable given.

a = S − Sr; S
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
start with:

a = s - sr

factor out the s on the right hand side of the equation to get:

a = s * (1-r)

divide both sides of the equation by (1-r) to get:

a / (1-r) = s

based on the symmetric property of equality, this is the same as:

s = a / (1-r)

the properties of equality are summarized below:

http://www.mathwords.com/e/equation_rules.htm