How do unbounded and infeasible solutions make sense in the real world?
537684
Sometimes knowing that there is no answer can be as good as knowing what the answer is.
966956
They are better when finding answers to a question with possibly more than one right answer. For example, solve for x: 5x=15 would be best with an equation because it's easily solvable with one answer. Whereas, A number greater than 9 but less than 12 would be set up as 9<x<12 or 9<x & x<12.  This way, x could be any number between 9 and 12, having infinate solutions. If you have to see how much money you can spend with out going over the allotted amount, would be a real world situation. (IE- You have 20 dollars to spend, and you can't spend negative dollars, so 0<x<20). There you go!
821827
Engineers see real world problems and come up with effective and cost-efficient solutions that would benefit society. I'm an engineer (or at least have a degree) and my friends and I used to come up with solutions for small problems that used to bug us right in the faculty! I never would have been able to do that before. Plus, you have the skills to do it yourself, instead of hiring and paying someone else to do it.
396946
right.  so, yeah, you're not going to solve the P & NP problem on yahoo answers.\n\nand to give you the proper answer to your question:\nfor all we know there could be, but we aren't even certain of this possibility.  it's conjectured that all NP-complete problems are not solvable in polynomial time, but whether this is a provable conjecture is unknown.
273146
:}\nchance without cause is a logical impossibility
976141
What value does x approach?  Without that information, there is no solution.
67585
Formulaically it reduces down to x*z = x*z, so no matter which numbers you plug in for any of the values it will be a valid equation.  \n\n(x*(y+z))-(x*y)=x*z      becomes\nx*y + x*z - x*y = x*z     rewrite that as \nx*y + x*z + -(x*y) = x*z    the positive and negative x*y terms cancel,leaving\n\nx*z = x*z\n\nSince that is a truism, an infinite number of solutions exist.
871614
book: the boundary-less organization
159422
Is this a trick question? For a given system of linear equations, there is one solution that will yield a particular answer. There are infinite possible systems that will yield that answer (x=-2). There are also multiple ways to arrive at the same  correct answer for a given system. I think we need more info to be of any real help...
1078061
This is the question described in shorthand by computer scientists as does P = NP? The answer is the problem has never been solved, so you can't be certain.  But most likely it isn't possible.
189806
Irrational persistent actions
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Substitute or plug in the value for x an solve the problem using PEMDAS\n\nParentheses\nExponents\nMultiplication&\nDivision\nAddition&\nSubtraction
247965
infinite values for both,\nits caus u cant solve two variables with just one equation
67154
One where input is solicited, but for which no definitive solution is expected or possible.
838624
Finite but unbounded.
1186148
There used to be a lot of them, but with computers these days they are being solved by brute force. Examples include Fermat's Last Theorem and the Four Color problem in topology. You can look those up to see what they are, and you will probably find sites listing other unsolved mathematical puzzles.
1076564
What do you want to solve for? x? y? or do you want an ordered pair (x,y) that works (integers maybe?)