Hey there,

Getting very stuck on solving these, ive tried using substitution but i dont know how to rearrange it...

can you help?

and

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- May 11th 2010, 02:36 AMdarksupernovaSimoultaneous equations
Hey there,

Getting very stuck on solving these, ive tried using substitution but i dont know how to rearrange it...

can you help?

and

- May 11th 2010, 02:46 AMBacterius
Hi,

to rearrange for in the first equation, you can substract then multiply by . So you find :

So :

Setting to make it a bit simpler, we are left with :

So :

Substituting back the value we chose for , we get :

Finding the value of is now straightforward :)

Does it make sense ? Remember not to get stopped by impressive square roots and stuff : as long as there are no terms in them, they can be considered a constant (and thus substituted to some letter, in my example) - May 11th 2010, 03:46 AMdarksupernova
ah yes that helps thanks very much!

i see the way you got the unkown terms on one side, very nice ;)

Thanks again,

Max - May 11th 2010, 04:07 AMWilmer
- May 11th 2010, 05:11 AMHallsofIvy
Seeing "x" alone in both equations, the first thing I would think of is subtracting one equation from the other: