Finding the Complements of W in R^4 to Orthogonal Vectors and Systems

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W is sub space of R^4 which is defined as
http://img21.imageshack.us/img21/1849/63042233.th.gif

find the system that defines the complements W^\perp of W
i have solved the given system and i got one vector (-1,1,0,0)
so its complement must be of R^3 and each one of the complements vectors are
orthogonal to it

how to find them
??
 
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solved it :)
 

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