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Equation Systems... how to?

 
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GiovanniParodi
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Joined: 10 Jun 2005
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PostPosted: Fri Jun 10, 2005 4:49 am    Post subject: Equation Systems... how to? Reply with quote

Hello everybody, I need to create an equation system with Math, but I'm not able to do that.
How can I create a system with the following equations
x = a+b
y = c+d
?
In fact I tried
lbrace x=a+b {} newline y=c+d
but it doesn't work because there's not the rbrace..
But I don't want the rbrace, so how can I do?
Thanks a lot Giovanni
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David
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PostPosted: Fri Jun 10, 2005 5:13 am    Post subject: Re: Equation Systems... how to? Reply with quote

GiovanniParodi wrote:
Hello everybody, I need to create an equation system with Math, but I'm not able to do that.
How can I create a system with the following equations
x = a+b
y = c+d
?
In fact I tried
lbrace x=a+b {} newline y=c+d
but it doesn't work because there's not the rbrace..
But I don't want the rbrace, so how can I do?
Thanks a lot Giovanni


Hi, Giovanni.

First of all, that is not strictly a "system" of linear equations in two variables "x" and "y", which might look more like this:

2x + 3y = 7
3x - 5y = 1

You don't need the math editor for that. Just use the word processor. The editor is not a symbolic algebra program ...it won't calculate, just present the symbols. The symbols you use here are available in the word processor from the keyboard. The math editor is primarily for those symbols and formats not otherwise available from the keyboard. To do abstract algebra calculations, you'd need a pogram like Mupad, Maple, Derive, Mathematica, and so on. You can set up a spreadsheet to do numerical calculations, as in finding solutions to the linear system 3x + 2y = 5, 2x - 3y = 7. If simply wanting the appearance shown, you've already done it when you typed your request here:

x = a+b
y = c+d

but can do no further calculation on that set of statements.

I suspect that's what you want, since you already have the "solution" format for "x" and "y".

David.


Last edited by David on Fri Jun 10, 2005 5:26 am; edited 2 times in total
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RGB
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Joined: 25 Nov 2003
Posts: 1743
Location: In Lombardy, near a glass of red Tuscany wine

PostPosted: Fri Jun 10, 2005 5:20 am    Post subject: Reply with quote

The right brace could be replaced be the command:
Code:
right none

BUT, you cannot put a line break between braces. Instead of that, use a matrix or stack
Code:
left lbrace stack{x=a+b#y=c+d} right none

If you need the equal signs at the same level, use a matrix
Code:
left lbrace matrix{x # "=" # a+b ## y # "=" # c+d}  right none
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GiovanniParodi
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Joined: 10 Jun 2005
Posts: 2

PostPosted: Fri Jun 10, 2005 5:26 am    Post subject: Reply with quote

Thans a lot to everybody,
in fact my english is not as good as yours Sad
The correct answer to my doubts ha been placed by RGB, I want only a symbolic representation of an equation system...
However thanks a lot also to David for his kindness...
thanks again Giovanni
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richardf
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Joined: 10 Oct 2004
Posts: 107

PostPosted: Sat Jun 11, 2005 7:47 am    Post subject: Reply with quote

I usually do it as follows:

left lbrace binom {alignl x = a + b} {alignl y = c+d} right none

Richard
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Piter_
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Joined: 13 Nov 2011
Posts: 10

PostPosted: Sun Nov 13, 2011 5:20 am    Post subject: Reply with quote

Hi. Is it possible to assign separate number to each of the equation in the system? If I make a system as described above it is numbered as one equiaton.
Thanks
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Robert Tucker
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Joined: 16 Aug 2004
Posts: 3407
Location: Manchester UK

PostPosted: Sun Nov 13, 2011 9:01 am    Post subject: Reply with quote

http://wiki.services.openoffice.org/wiki/Documentation/FAQ/Formula/How_do_I_number_my_equations%3F
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