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GiovanniParodi
Newbie
Joined: 10 Jun 2005
Posts: 2
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 Posted: Fri Jun 10, 2005 4:49 am Post subject: Equation Systems... how to? |
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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
Super User
Joined: 24 Oct 2003
Posts: 5668
Location: Canada
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| Posted: Fri Jun 10, 2005 5:13 am Post subject: Re: Equation Systems... how to? |
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| 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
Super User
Joined: 25 Nov 2003
Posts: 1743
Location: In Lombardy, near a glass of red Tuscany wine
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| Posted: Fri Jun 10, 2005 5:20 am Post subject: |
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The right brace could be replaced be the command:
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
Newbie
Joined: 10 Jun 2005
Posts: 2
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| Posted: Fri Jun 10, 2005 5:26 am Post subject: |
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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 |
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richardf
OOo Enthusiast
Joined: 10 Oct 2004
Posts: 107
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| Posted: Sat Jun 11, 2005 7:47 am Post subject: |
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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_
General User
Joined: 13 Nov 2011
Posts: 10
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| Posted: Sun Nov 13, 2011 5:20 am Post subject: |
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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: 3367
Location: Manchester UK
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