Subjects linear algebra

Matrix Solving E3613A

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Matrix Solving E3613A


1. The problem is to create a matrix from the given modified variable names and propose a method to solve it. 2. Since no specific variables or equations are provided, let's assume you want to form a system of linear equations represented by a matrix. 3. A matrix is a rectangular array of numbers arranged in rows and columns, often used to represent systems of linear equations. 4. To solve a system represented by a matrix, common methods include Gaussian elimination, matrix inversion (if the matrix is square and invertible), or using determinants (Cramer's rule). 5. For example, if you have variables $x$, $y$, and $z$ and equations: $$ \begin{cases} a_{11}x + a_{12}y + a_{13}z = b_1 \\ a_{21}x + a_{22}y + a_{23}z = b_2 \\ a_{31}x + a_{32}y + a_{33}z = b_3 \end{cases} $$ 6. This can be written as matrix equation: $$ A\mathbf{x} = \mathbf{b} $$ where $$ A = \begin{bmatrix} a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ a_{31} & a_{32} & a_{33} \end{bmatrix}, \quad \mathbf{x} = \begin{bmatrix} x \\ y \\ z \end{bmatrix}, \quad \mathbf{b} = \begin{bmatrix} b_1 \\ b_2 \\ b_3 \end{bmatrix} $$ 7. To solve for $\mathbf{x}$, if $A$ is invertible, use: $$ \mathbf{x} = A^{-1} \mathbf{b} $$ 8. Alternatively, use Gaussian elimination to reduce the augmented matrix $[A|\mathbf{b}]$ to row echelon form and solve by back substitution. 9. Without specific data, this is the general approach to create and solve a matrix system from variables. Final answer: Form the coefficient matrix $A$ and constant vector $\mathbf{b}$ from your variables and equations, then solve $A\mathbf{x} = \mathbf{b}$ using Gaussian elimination or matrix inversion if applicable.