Posted by **Sarah** on Wednesday, August 17, 2011 at 7:54am.

1. make p the subject:

p/p-3= R

2. make R the subject

a= 1- 1/R

- Mathematics -
**Reiny**, Wednesday, August 17, 2011 at 8:01am
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.

- To Reiny -
**Sarah**, Wednesday, August 17, 2011 at 8:27am
So for the second one, I multiplied each term by R

aR= R- 1

but then I got stuck after that... sorry

- Mathematics -
**Reiny**, Wednesday, August 17, 2011 at 8:30am
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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