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 04-23-2011, 11:05 AM #11 ~~~~~~~~   Join Date: Jan 2005 Location: Wales Posts: 5,556 Re: Math Problem (Simple) x + y = 7. Solve Please. __________________
 04-23-2011, 12:50 PM #12 Site Team     Join Date: May 2006 Posts: 7,903 Re: Math Problem (Simple) You need an equation for every variable. One equation and 2 variables has an infinite amount of solutions. __________________ __________________ “Adults are just obsolete children and the hell with them.” - Dr. Suess
04-23-2011, 12:53 PM   #13
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Re: Math Problem (Simple)

Quote:
 One equation and 2 variables has an infinite amount of solutions.
Exactly - for that example, give one of the unknowns any real number apart from 0 and you can find another real number (easily) to apply to the other unknown to make the equation work.

Generally speaking, simultaneous equations are needed when you're dealing with more than one unknown.
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04-23-2011, 02:27 PM   #14
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Re: Math Problem (Simple)

Quote:
 Originally Posted by j03 x + y = 7. Solve Please.
Easy
3.5+3.5=7
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04-23-2011, 02:49 PM   #15
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Re: Math Problem (Simple)

Quote:
 Easy 3.5+3.5=7
You're not getting the point - while that is a solution, it's not the solution - similar to your first problem.

Yes, 3.5+3.5=7. But 1+6=7, 2+5=7, 3+4=7, 6+0.5=7 - ad infinitum.
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 04-23-2011, 05:56 PM #16 Guru     Join Date: Jan 2008 Location: U.S. Posts: 7,841 Re: Math Problem (Simple) Basic linear algebra says that any system of equations with more unknown variables than equations has infinite solutions. This is a system of 1 equation with 2 unknown variables. There are infinite solutions to this problem therefore it is degenerate. Go back to middle school and learn algebra.
 04-23-2011, 06:32 PM #17 Site Team     Join Date: Mar 2004 Posts: 7,872 Re: Math Problem (Simple) how about x + y = 7 and x + 2y = 10 do you realise how that's different to the question that you asked? because there is more information given by that second equation. it should be simple enough to do in your head. __________________ I didn’t fight my way to the top of the food chain to be a vegetarian… Im sick of people saying 'dont waste paper'. If trees wanted to live, they'd all carry guns. "The inherent vice of capitalism is the unequal sharing of blessings; The inherent vice of socialism is the equal sharing of miseries."
 04-23-2011, 06:56 PM #18 Site Team     Join Date: May 2006 Posts: 7,903 Re: Math Problem (Simple) x=4 y=3, what do I win? __________________ “Adults are just obsolete children and the hell with them.” - Dr. Suess
 04-23-2011, 07:27 PM #19 Guru     Join Date: Jan 2008 Location: U.S. Posts: 7,841 Re: Math Problem (Simple) Give me some eigenvalues and eigenvectors now. edit: Of the homogeneous system, that is.
 04-23-2011, 07:36 PM #20 Site Team     Join Date: May 2006 Posts: 7,903 Re: Math Problem (Simple) pfft, I'm not putting that much time into this. This is Saturday night! __________________ __________________ “Adults are just obsolete children and the hell with them.” - Dr. Suess