Question: Populate a Matrix

Sorry to bore you guys with my boring questions. I'd like to perform an operation with 10 different equations one of which is pasted above.  I extracted the cofficients of variable x[i], i=1..10. I did this with the syntax [seq(coeffs(a[r], x[i]), i=1..10)]. I ran this in a for..loop that runs 10 times. where a[r] is the initialization of the 10 equations. Now my question is that I don't know how to populate a 10 by 10 matrix with all the coefficients extracted. and secondly is that is there another way of doing this conviniently? If yes pls. show me.

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