Example

Practice: Solving a System of Three Linear Equations Using a Matrix

Apply the matrix method to solve a system of three linear equations, such as: {3x+8y+2z=52x+5y3z=0x+2y2z=1\left\{\begin{array}{l} 3x + 8y + 2z = -5 2x + 5y - 3z = 0 x + 2y - 2z = -1 \end{array}\right. First, write the augmented matrix for the system. Next, systematically apply row operations to achieve row-echelon form, ensuring the diagonal entries are 1 and the entries below them in their respective columns are 0. Once the matrix is in row-echelon form, write the corresponding system of equations. Finally, use back-substitution to find the remaining variables, and write the solution as the ordered triple (9,3,1)(-9, 3, -1). Always check that the solution makes the original equations true.

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Updated 2026-06-24

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Ch.4 Systems of Linear Equations - Intermediate Algebra @ OpenStax

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