Chapter 5, Problem 18RE

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7th Edition

Stefan Waner + 1 other

ISBN: 9781337274203

Textbook Problem

In Exercises 17–20, write the given system of linear equations as a matrix equation, and solve by inverting the coefficient matrix.

To determine

**To calculate:** The matrix equation of the system of linear equations and solve by inverting the coefficient matrix

Explanation

**Given Information:**

The system of linear equations are

**Formula used:**

In the matrix equation *A* has entries equal to the coefficients of the left side of the system of equations and the matrix *X* is the column matrix of the unknowns in the system and the matrix *B* is the column matrix and has entries equal to the coefficients of the right side of the system of equations.

*I* is the

The two matrices *A* and *B* are equal if they have same dimensions, also their corresponding entries are equal.

For matrices *A* have dimension *B* have dimension *AB* is the matrix of dimension *ij*th entry of *AB* is the sum of product of corresponding entries of the row *i* of *A* and the column *j* of *B*.

**Calculation:**

Consider the system of linear equations,

Recall that in the matrix equation *A* has entries equal to the coefficients of the left side of the system of equations and the matrix *X* is the column matrix of the unknowns in the system and the matrix *B* is the column matrix and has entries equal to the coefficients of the right side of the system of equations.

Thus,

Hence, the matrix equation is

Solve the equation for *X*.

Consider the equation

Multiply both sides on the left of the equation by

Recall that *I* is the

Substitute

Thus, the equation is

Consider the matrix

Recall that a matrix with *m* rows and *n* columns is of dimension *m* and *n* are positive integers.

Since, number of rows in

Substitute *m* and *n* in

Thus, dimension of

Augment the matrix with the

Thus, the augmented matrix is

Row reduce the matrix

Perform the row operations

Perform the row operations

Perform the row operations

Thus,

Sect-5.1 P-1ESect-5.1 P-2ESect-5.1 P-3ESect-5.1 P-4ESect-5.1 P-5ESect-5.1 P-6ESect-5.1 P-7ESect-5.1 P-8ESect-5.1 P-9ESect-5.1 P-10E

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P-73ESect-5.3 P-74ESect-5.3 P-75ESect-5.3 P-76ESect-5.3 P-77ESect-5.3 P-78ESect-5.4 P-1ESect-5.4 P-2ESect-5.4 P-3ESect-5.4 P-4ESect-5.4 P-5ESect-5.4 P-6ESect-5.4 P-7ESect-5.4 P-8ESect-5.4 P-9ESect-5.4 P-10ESect-5.4 P-11ESect-5.4 P-12ESect-5.4 P-13ESect-5.4 P-14ESect-5.4 P-15ESect-5.4 P-16ESect-5.4 P-17ESect-5.4 P-18ESect-5.4 P-19ESect-5.4 P-20ESect-5.4 P-21ESect-5.4 P-22ESect-5.4 P-23ESect-5.4 P-24ESect-5.4 P-25ESect-5.4 P-26ESect-5.4 P-27ESect-5.4 P-28ESect-5.4 P-29ESect-5.4 P-30ESect-5.4 P-31ESect-5.4 P-32ESect-5.4 P-33ESect-5.4 P-34ESect-5.4 P-35ESect-5.4 P-36ESect-5.4 P-37ESect-5.4 P-38ESect-5.4 P-39ESect-5.4 P-40ESect-5.4 P-41ESect-5.4 P-42ESect-5.4 P-43ESect-5.4 P-44ESect-5.4 P-45ESect-5.4 P-46ESect-5.4 P-47ESect-5.4 P-48ESect-5.4 P-49ESect-5.4 P-50ESect-5.4 P-51ESect-5.4 P-52ESect-5.4 P-53ESect-5.4 P-54ESect-5.4 P-55ESect-5.4 P-56ESect-5.4 P-57ESect-5.4 P-58ESect-5.5 P-1ESect-5.5 P-2ESect-5.5 P-3ESect-5.5 P-4ESect-5.5 P-5ESect-5.5 P-6ESect-5.5 P-7ESect-5.5 P-8ESect-5.5 P-9ESect-5.5 P-10ESect-5.5 P-11ESect-5.5 P-12ESect-5.5 P-13ESect-5.5 P-14ESect-5.5 P-15ESect-5.5 P-16ESect-5.5 P-17ESect-5.5 P-18ESect-5.5 P-19ESect-5.5 P-20ESect-5.5 P-21ESect-5.5 P-22ESect-5.5 P-23ESect-5.5 P-24ESect-5.5 P-25ESect-5.5 P-26ESect-5.5 P-27ESect-5.5 P-28ESect-5.5 P-29ESect-5.5 P-30ESect-5.5 P-31ESect-5.5 P-32ESect-5.5 P-33ESect-5.5 P-34ESect-5.5 P-35ESect-5.5 P-36ESect-5.5 P-37ESect-5.5 P-38ESect-5.5 P-39ESect-5.5 P-40ESect-5.5 P-41ESect-5.5 P-42ECh-5 P-1RECh-5 P-2RECh-5 P-3RECh-5 P-4RECh-5 P-5RECh-5 P-6RECh-5 P-7RECh-5 P-8RECh-5 P-9RECh-5 P-10RECh-5 P-11RECh-5 P-12RECh-5 P-13RECh-5 P-14RECh-5 P-15RECh-5 P-16RECh-5 P-17RECh-5 P-18RECh-5 P-19RECh-5 P-20RECh-5 P-21RECh-5 P-22RECh-5 P-23RECh-5 P-24RECh-5 P-25RECh-5 P-26RECh-5 P-27RECh-5 P-28RECh-5 P-29RECh-5 P-30RECh-5 P-31RECh-5 P-32RECh-5 P-33RECh-5 P-34RECh-5 P-35RECh-5 P-36RECh-5 P-37RECh-5 P-38RECh-5 P-39RECh-5 P-40RECh-5 P-41RECh-5 P-42RECh-5 P-43RECh-5 P-44RECh-5 P-45RECh-5 P-46RECh-5 P-47RECh-5 P-48RECh-5 P-49RECh-5 P-50RECh-5 P-51RECh-5 P-52RE

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