MathAlgebraLinear algebraSystems of linear equations

Matrix representation of systems of linear equations

Theory

An element in the matrix of the system

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What variable does the coefficient in the position (2,1)(2,1) correspond to?

Matrix (287137593475)\left( \begin{array}{ccc|c} 2 & 8& 7 & 1\\ 3 & 7 & 5 & 9\\ 3 & 4 & 7 & 5\\ \end{array} \right) . In the answer write x, y or z.

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