# rearranging equation

• October 10th 2008, 07:46 AM
scarface1
rearranging equation
hi how do I rearrange this equation to give me the value of J

G= pi x D^2/ 4JL

Thanks
• October 10th 2008, 07:49 AM
watchmath
Quote:

Originally Posted by scarface1
hi how do I rearrange this equation to give me the value of J

G= pi x D^2/ 4JL

Thanks

$G= \pi \times D^2/ 4JL=\frac{\pi D^2}{4JL}$

Now multily both sides by $4JL$ and try to solv it for J
• October 10th 2008, 07:57 AM
scarface1
i dont quite understand which two sides im supposed to multiply :S
could you possibly explain this step by step please

Thank you so much
• October 10th 2008, 08:47 AM
jpatrie
If i'm reading the question correctly, it's $G=\frac{\pi(D^2)}{4JL}$

So;

$\pi(D^2)=4GJL$

$\frac{\pi(D^2)}{4GL}=J$
• October 10th 2008, 08:48 AM
jpatrie
You would cross multiply and solve for $J$