20. Can every vector in R* be written as a linear combination of the columns of the matrix B above? Do the columns of B span R?

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
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Chapter4: Vector Spaces
Section4.6: Rank Of A Matrix And Systems Of Linear Equations
Problem 69E: Consider an mn matrix A and an np matrix B. Show that the row vectors of AB are in the row space of...
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Please give a solution to the screenshot. Please only answer Question 20. Please give full reasoning. 

 

3
3
1
3 -2
2
-1
-1
-1
1
1
1 -5
A =
B =
0 -4
0 3 -1
2 -8
1
2 -3
7
-2 -8
2 -1
17. How many rows of A contain a pivot position? Does the
equation Ax = b have a solution for each b in R*?
18. Do the columns of B span R4? Does the equation Bx= y
have a solution for each y in R4?
19. Can each vector in R* be written as a linear combination of
the columns of the matrix A above? Do the columns of A
span R4?
20. Can every vector in R* be written as a linear combination of
the columns of the matrix B above? Do the columns of B
span R3?
Transcribed Image Text:3 3 1 3 -2 2 -1 -1 -1 1 1 1 -5 A = B = 0 -4 0 3 -1 2 -8 1 2 -3 7 -2 -8 2 -1 17. How many rows of A contain a pivot position? Does the equation Ax = b have a solution for each b in R*? 18. Do the columns of B span R4? Does the equation Bx= y have a solution for each y in R4? 19. Can each vector in R* be written as a linear combination of the columns of the matrix A above? Do the columns of A span R4? 20. Can every vector in R* be written as a linear combination of the columns of the matrix B above? Do the columns of B span R3?
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