# Rearrange the formula

• October 5th 2011, 12:23 PM
Stuu
Rearrange the formula
So I've been trying for the last hour, to no avail.

p = 2+j/J-3

Rearrange the formula so j is the subject.
• October 5th 2011, 12:38 PM
SpringFan25
Re: Rearrange the formula
Quote:

p = 2+j/J-3
The equation as your wrote it is ambiguous. Please rewrite in a non ambiguous way.

eg, do you mean:

$p = \frac{2+j}{j-3}$

or

$p = \frac{2+j}{j} -3$

or...etc
• October 5th 2011, 12:41 PM
Stuu
Re: Rearrange the formula
$p = \frac{2+j}{j-3}$
• October 5th 2011, 12:42 PM
SpringFan25
Re: Rearrange the formula
$p=\frac{2+j}{j-3}$

(multiply by [j-3])

$(j-3)p={2+j}$

expand the brackets on the left, collect terms, and finish.

Spoiler:

$(j-3)p={2+j}$

$jp-3p={2+j}$

$jp-j -3p=2$

$j(p-1) -3p=2$

$j(p-1) =2+3p$

$j=\frac{2+3p}{(p-1)}$