(a) A matrix has four columns. (b) Every matrix has a unique reduced row-echelon form
Chapter 1, Problem 58(choose chapter or problem)
(a) A matrix has four columns. (b) Every matrix has a unique reduced row-echelon form. (c) A homogeneous system of four linear equations in four variables is always consistent. (d) Multiplying a row of a matrix by a constant is one of the elementary row operations.
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