# SOLUTION: r=ab/a+b ;a solve for a

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 Question 57746This question is from textbook mcdougal littell : r=ab/a+b ;a solve for aThis question is from textbook mcdougal littell Found 2 solutions by stanbon, funmath:Answer by stanbon(60771)   (Show Source): You can put this solution on YOUR website!r=ab/(a+b) ;a solve for a Cross-multiply to get: ra+rb=ab Get the "a's' on one side: ab-ra=rb Factor out the "a" to get: a(b-r)=rb a=rb/(b-r) Cheers, Stan H. Answer by funmath(2926)   (Show Source): You can put this solution on YOUR website! ;a solve for a Multiply both sides by LCD. Get all the a's on one side of the = sign Get the things without a's on the other side of the = sign. Factor out the a on the left. Divide both sides by r-b. it could be written as: Happy Calculating!!!