Linear Algebra: Row Echelon Form?

1 Reduced Row Echelon Form: (only the diagonal contains 1's, the rest is 0's) I put "." after some numbers to make it easier to read. Let's do column 1: ..? 1 -1 -2 1? 0?

2 -1 -3 2? -6? - 2R?

(subtract the first row(equation) twice from the second)? -1. 2.

1 3? 1? ..? 1 -1 -2 1?

0? 0. 1.

1 0? -6? -1.

2. 1 3? 1?

+ R? (add row 1 to row 3) let's do the next column: .... .? 1 -1 -2 1? 0?

+ R? (add row 2 to row 1)? 0.

1. 1 0? -6?

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