Fill in the missing entries by performing the indicated row operations to obtain the row-reduced matrices.   1 3 1 3   3 8 3 7 2 −1 1 −6 R2 − 3R1 R3 − 2R1   1 3 1 3                       −R2          1 3 1 3           0 −7 −1 −12     R1 − 3R2 R3 + 7R2             0 1 0 2             R1 + R3     −R3       1 0 0 −1   0 1 0 2 0 0 1 −2

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.2: Direct Methods For Solving Linear Systems
Problem 15EQ: 15. Reverse the elementary row operations used in Example 2.9 to show that we can convert
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Fill in the missing entries by performing the indicated row operations to obtain the row-reduced matrices.
 
1 3 1 3
 
3 8 3 7
2 −1 1 −6
R2 − 3R1
R3 − 2R1
 
1 3 1 3
 
       
       
 
 
−R2
      
 
1 3 1 3
 
       
0 −7 −1 −12
 
 
R1 − 3R2
R3 + 7R2
 
       
 
0 1 0 2
       
 
 
R1 + R3
    −R3    
 
1 0 0 −1
 
0 1 0 2
0 0 1 −2
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