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GiovanniParodi
Newbie

Joined: 10 Jun 2005
Posts: 2

 Posted: Fri Jun 10, 2005 4:49 am    Post subject: Equation Systems... how to? 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
David
Super User

Joined: 24 Oct 2003
Posts: 5668

Posted: Fri Jun 10, 2005 5:13 am    Post subject: Re: Equation Systems... how to?

 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
RGB
Super User

Joined: 25 Nov 2003
Posts: 1743
Location: In Lombardy, near a glass of red Tuscany wine

Posted: Fri Jun 10, 2005 5:20 am    Post subject:

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
GiovanniParodi
Newbie

Joined: 10 Jun 2005
Posts: 2

 Posted: Fri Jun 10, 2005 5:26 am    Post subject: Thans a lot to everybody, in fact my english is not as good as yours 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
richardf
OOo Enthusiast

Joined: 10 Oct 2004
Posts: 107

 Posted: Sat Jun 11, 2005 7:47 am    Post subject: I usually do it as follows: left lbrace binom {alignl x = a + b} {alignl y = c+d} right none Richard
Piter_
General User

Joined: 13 Nov 2011
Posts: 10

 Posted: Sun Nov 13, 2011 5:20 am    Post subject: 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
Robert Tucker
Moderator

Joined: 16 Aug 2004
Posts: 3407
Location: Manchester UK

 Posted: Sun Nov 13, 2011 9:01 am    Post subject: http://wiki.services.openoffice.org/wiki/Documentation/FAQ/Formula/How_do_I_number_my_equations%3F_________________OpenOffice 4.0.0 and LibreOffice 4.x.x on Fedora 20, Ubuntu 13.10, Windows 8.1 Preview (Triple Boot)
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