A consistent system of linear equations in 14 unknowns is reduced to row echelon.....

singing

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A consistent system of linear equations in 14 unknowns is reduced to row echelon form. There are then 10 non-zero rows (i.e. 10 pivots). How many parameters (free variables) will occur in the solution?
 
This looks pretty straight forward if you know the definitions. What have you tried yourself? Where do you have a problem?
 
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