Which operation can be used with the augmented matrix? the 3 by 4 matrix, row 1, column 1, 3 column 2, negative 2 column 3, 1 column 4, 15 row 2, column 1, 1 column 2, 5 column 3, 8 column 4, 15 row 3, column 1, negative 2 column 2, negative 1 column 3, 3 column 4, 1

Elementary row operations allow you to replace one row with itself plus a multiple of another row. Choice D replaces row 3 with row 3 plus (−1) times row 2, which is a valid row operation. Adding a row to a column or switching columns is not an elementary row operation, and multiplying a row by 0 is not allowed because it destroys information.

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