MathAlgebraLinear algebraSystems of linear equations

Matrix representation of systems of linear equations

Number of variables in matrix form

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How many variables are there in the system represented by the matrix $\left( \begin{array}{cc|c} 2 & 7 & 9 \\ 4 & 2 & 5\\ 6 & 1 & 8\\ \end{array} \right)$ ?

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