MathAlgebraLinear algebraMatrices

Introduction to matrices

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Which of the following is a 2 by 3 matrix where element x2,1=7x_{2,1} = 7

A=(270901)B=(−250701)C=(270390)D=(217368)A = \begin{pmatrix} 2 & 7 & 0 \\ 9 & 0 & 1 \end{pmatrix} B = \begin{pmatrix} -2 & 5 & 0 \\ 7 & 0 & 1 \end{pmatrix} C = \begin{pmatrix} 2 & 7 \\ 0 & 3 \\ 9 & 0 \end{pmatrix} D = \begin{pmatrix} 2 & 1 \\ 7 & 3 \\ 6 & 8 \end{pmatrix}

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