(a) Are the following matrices row-equivalent? 3063 02 32 5-723 (b) Removing the 2nd column of each matrix gives 363 032 523 M₁ M₁ M₂ 3 3 5 12 7 2 9 5 -13 -7 -3 3 12 7 39 5 5-7 -3 Use a computational tool to determine whether or not these matrices are row equivalent. (c) Could removing the same column from a pair of equivalent matrices affect row equivalence? If so, give an example. If not, give a short justification.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter2: Systems Of Linear Equations
Section2.2: Direct Methods For Solving Linear Systems
Problem 3CEXP
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1. A matrix by any other name¹
Two matrices are row equivalent if one matrix can be changed into another matrix
by a series of elementary row operations.
(a) Are the following matrices row-equivalent?
3 063
0232 , M₂ =
5-7 23
M₁ =
(b) Removing the 2nd column of each matrix gives
363
3
032 , M₂ 3
523
M₁ =
3
3
5
6
1
-2
4
2
-13
8 2
3 2
-7 0
12 7
9 5
-7 -3
Use a computational tool to determine whether or not these matrices are row
equivalent.
12
7
9
5
5 -7 -3
(c) Could removing the same column from a pair of equivalent matrices affect row
equivalence? If so, give an example. If not, give a short justification.
(d) Show that the system of equations corresponding to the augmented matrix
has no solutions.
(e) [challenge] What could happen to the solution set of a linear system when you
remove a row from the augmented matrix? What does this tell you about the
effect of removing a row on row-equivalence?
(f) [challenge] Determine whether the following statements are true or false. If
the statement is true, give a 2 to 3 sentence proof. If the statement is false, give
a counter example.
i. Row-equivalent augmented matrices have the same solution set.
ii. Augmented matrices with the same solution set are row-equivalent.
Transcribed Image Text:1. A matrix by any other name¹ Two matrices are row equivalent if one matrix can be changed into another matrix by a series of elementary row operations. (a) Are the following matrices row-equivalent? 3 063 0232 , M₂ = 5-7 23 M₁ = (b) Removing the 2nd column of each matrix gives 363 3 032 , M₂ 3 523 M₁ = 3 3 5 6 1 -2 4 2 -13 8 2 3 2 -7 0 12 7 9 5 -7 -3 Use a computational tool to determine whether or not these matrices are row equivalent. 12 7 9 5 5 -7 -3 (c) Could removing the same column from a pair of equivalent matrices affect row equivalence? If so, give an example. If not, give a short justification. (d) Show that the system of equations corresponding to the augmented matrix has no solutions. (e) [challenge] What could happen to the solution set of a linear system when you remove a row from the augmented matrix? What does this tell you about the effect of removing a row on row-equivalence? (f) [challenge] Determine whether the following statements are true or false. If the statement is true, give a 2 to 3 sentence proof. If the statement is false, give a counter example. i. Row-equivalent augmented matrices have the same solution set. ii. Augmented matrices with the same solution set are row-equivalent.
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