Question 802850
<pre>
Put the matrix in row echelon form, using row operations such that:

1. All zero rows are at the bottom of the matrix. 
2. The element in the upper left corner is 1. 
3. The first nonzero element in any nonzero row is 1.
4. The first nonzero element in any nonzero row can only have 0's below it.
5. The leftmost nonzero element in each nonzero row after the first 
   occurs to the right of the leftmost nonzero element of the previous row. 

To have a unique solution, the next to last element on the bottom
row of the echelon form must not be 0. 
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To have infinitely many solutions, the last row must have all zeros. 
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To have no solution, the next to last element on the bottom
row must be 0 and the last element on the bottom row not be zero. 
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Edwin</pre>