Posted by Sarah on Wednesday, August 17, 2011 at 7:54am.
You must mean
p/(p-3) = R
cross-multiply
Rp - 3R = p
Rp - p = 3R
p(R-1) = 3R
p = 3R/(R-1)
for the second, multiply each term by R, rearrange and factor in a similar way.
Let me know what you get.
So for the second one, I multiplied each term by R
aR= R- 1
but then I got stuck after that... sorry
you are looking for R, so get the R's to one side
aR - R = -1
factor out the R
R(a-1) = -1
divide both sides by a-1
R = -1/(a-1)
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