For what value/s of r and t does the system: 4z t 2Y 7z 2x бу -3x бу rz have (a) exactly one solution (b) no solution, and (c) an infinite number of solutions? 3. I3D %3D %3D

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 2BEXP
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For what value/s of r and t does the system:
2y
4z
t
%3D
2x
бу
7z
%3D
-3x
бу
+
rz
3
%3D
have (a) exactly one solution (b) no solution, and (c) an infinite number of solutions?
Assisted computation: This computation is already DONE for you. The
objective of this problem is to answer the following with very FEW calculations, if any.
You are given that the rref of the augmented matrix:
5
-25
-6
-14
-3
15
-2
|
8.
2
-10
-8
4
-20
-23
-6
rref:
1
-5
-4
-7
a.Find a set of vectors S such that Span(S) is the rowspace of A.
b.Find a a set of vectors T such that Span(T) is the columnspace of A.
c.Express the "rejected" (not used) columns of A as linear combinations of the vectors in (b).
d.Find a a set of vectors N such that Span(N) is the nullspace of A.
e.Express all solutions of the matrix system Ax=b, if any, in terms of a sum x_{p} + x_{h}, where
x_{p} is a particular solution, and x_{h} is a member of the nullspace of A.
Transcribed Image Text:4 For what value/s of r and t does the system: 2y 4z t %3D 2x бу 7z %3D -3x бу + rz 3 %3D have (a) exactly one solution (b) no solution, and (c) an infinite number of solutions? Assisted computation: This computation is already DONE for you. The objective of this problem is to answer the following with very FEW calculations, if any. You are given that the rref of the augmented matrix: 5 -25 -6 -14 -3 15 -2 | 8. 2 -10 -8 4 -20 -23 -6 rref: 1 -5 -4 -7 a.Find a set of vectors S such that Span(S) is the rowspace of A. b.Find a a set of vectors T such that Span(T) is the columnspace of A. c.Express the "rejected" (not used) columns of A as linear combinations of the vectors in (b). d.Find a a set of vectors N such that Span(N) is the nullspace of A. e.Express all solutions of the matrix system Ax=b, if any, in terms of a sum x_{p} + x_{h}, where x_{p} is a particular solution, and x_{h} is a member of the nullspace of A.
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