SOLUTION: b + a 1 _______ = ___ ab f solve for b. this is a proportion b+a over ab equals 1 over f. after cross product i dont know how to get the b by it's self.

SOLUTION: b + a 1 _____ = _ ab f solve for b. this is a proportion b+a over ab equals 1 over f. after cross product i dont know how to get the b by it's self.

Question 21437: b + a 1
_______ = ___

ab f
solve for b.
this is a proportion b+a over ab equals 1 over f.
after cross product i dont know how to get the b by it's self. I have been given the answer but dont know how to get there...
the answer is b= fa over a-f

Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Solve for b:
Multiply both sides by ab.
Multiply both sides by f.
Subtract bf from both sides.
Factor b from the right side.
Divide both sides by (a-f).
or
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