Algebra
posted by Sara .
Solve S=a/(1r) for r
S = a/(1r)
Multiply both sides by 1r
S*(1r) = [(1r)*a]/(1r)
Simplify
S*(1r) = a
Multiply terms on the left.
S  S*r = a
Subtract S from both sides.
SS*r  S = a  S
Simplify
S*r = a  S
Multiply both sides by 1
S*r = a+S
Divide both sides by S
S*r/S = (a + S)/S
r = (Sa)/S
Check my work carefully.
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