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Linear Systemsmedium
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Determine the effect of performing the elementary row operation R2→R2+3R1R_2 \to R_2 + 3R_1R2​→R2​+3R1​ on the matrix A=(12−31)A = \begin{pmatrix} 1 & 2 \\ -3 & 1 \end{pmatrix}A=(1−3​21​).