I need help with the Echelon Method on this problem x y z 4 x y z 10 2x y

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Latest exam Aptitude Question SOLUTION: I need help with the Echelon Method on this problem x-y+z=4 x+y+z=10 2x+y-3z=7 I understand the gauss jordan method to solve this but not the echelon? 3 variables throws