Chapter 4.2, Problem 39E

### Finite Mathematics and Applied Cal...

7th Edition
Stefan Waner + 1 other
ISBN: 9781337274203

Chapter
Section

### Finite Mathematics and Applied Cal...

7th Edition
Stefan Waner + 1 other
ISBN: 9781337274203
Textbook Problem

# In Exercises 1-42, use Gauss-Jordan row reduction to solve the given systems of equation. We suggest doing some by hand and others using technology. [HINT: See Examples 1-6.] x + y + z + u + v = 15 y − z + u − v = − 2 z + u + v = 12 u − v = − 1 v = 5

To determine

To calculate: The solution of the given system of equations x+y+z+u+v=15,yz+uv=2,z+u+v=12,uv=1,v=5 by the use of Gauss Jordan row reduction.

Explanation

Given Information:

The system of equation is,

x+y+z+u+v=15yāz+uāv=ā2z+u+v=12uāv=ā1v=5

Formula Used:

Elementary row operations

Type 1: Replacing the row Ri by aRi, where a is a nonzero number.

Type 2: Replacing the row Ri by aRiĀ±bRj, where a is a nonzero number.

Gauss Jordan reduction method

Step 1: First clear the fractions or decimals if any, using operations of type 1.

Step 2: Select the first nonzero element of the second row as pivot.

Step 3: Use the pivot to clear its column using operations of type 2.

Step 4: Select the first nonzero element in the third row a pivot and clear its column.

Step 5: Select the first nonzero element in the fourth row a pivot and clear its column.

Step 6: Select the first nonzero element in the fifth row a pivot and clear its column.

Calculation:

Consider the system of equation,

x+y+z+u+v=15yāz+uāv=ā2z+u+v=12uāv=ā1v=5

The augmented matrix for the given system of equations is,

[111111500001000ā11001110ā11ā11ā212ā15]

Apply Gauss Jordan reduction method to get the solution of the given system of equation.

Begin by, the selection of the pivot as the first nonzero element of the second row and clear its column.

Perform the operation R1āR1āR2

[111111500001000ā11001110ā11ā11ā212ā15]ā[102021700001000ā11001110ā11ā11ā212ā15]

Next pivot the first nonzero element of the third row and clear its column.

Perform the operation R1āR1ā2R3 and R2āR2+R3, [102021700001000ā11001110ā11ā11ā212ā15]ā[100ā20ā7000010000100211001ā111012ā15]

Next pivot the first nonzero element of the fourth row and clear its column.

Perform the operation R1āR1+2R4 and R2āR2ā2R4, [100ā20ā7000010000100211001ā111012ā15]ā[1000ā2ā9000010000100011021ā111212ā15]

Next clear the leftover element of that column

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