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## #1 2013-03-10 06:10:02

BarandaMan
Guest

### Derive and Equation Part 2...Help Appreciated!

I hope this picture is more clear: i49.tinypic.com/r8iic2.jpg

There are 4 parameters. Alpha, Beta, Yamma and the Circle with the line through.
Then a, a*, b, b*, g, g*, r and e.

These are meanings behind the letters, but there are no other links between these variables apart from those in the equations.

The question is:

Derive an equation for 'r' which does NOT contain a*, e, or r. and
Derive an equation for 'e' which does NOT contain a*, e, or r.

This is the whole chapter completed if you guys can help me with this! I have an answer for 'e', which can hopefully be checked against one of your answers but for 'r', I keep going around in circles and getting r=r, 0=0 or some equivalent statement but no expression!

I look forward to hearing your replies, thank you all!

## #2 2013-03-12 02:31:43

John E. Franklin
Member
Registered: 2005-08-29
Posts: 3,588

### Re: Derive and Equation Part 2...Help Appreciated!

For convenience, here is the image.
Click to enlarge.

igloo myrtilles fourmis

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## #3 2013-03-12 04:22:04

bob bundy
Registered: 2010-06-20
Posts: 8,322

### Re: Derive and Equation Part 2...Help Appreciated!

hi

Are those the same as the other day?

Equation 3 alone will give you r most simply.  Just move the beta r term to the left and the b to nrhe right.  Then divide by beta.

To get e you'll have to use equations 1 and 2.

Substitute the a* from (2) into (1).

Get all the 'e' terms on one side and the others on the other side.

Factorize the 'e' and divide by the bracket to get e on its own.

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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