nd a basis for the column space of A. What dimension is the column space? 3) Find a basis for the null space of A. What dimension is the null space? 4) What is the rank of A? What is the nullity of A? 5) Is the linear system Ax = b consistent for every b is an element of R4? 6) If the linear system Ax = b is consistent, how many solutions does it have, and how many parameters does it take to determine a solution?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.3: Spanning Sets And Linear Independence
Problem 31EQ
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Given that the 4 x 5 matrix A below is row equivalent to the matrix U;

A =

2 -4 4 2 6
1 -2 2 1 3
-1 2 1 -4 0
-2 4 -2 -4 0

row equivalent ---->

U =

1 -2 0 3 0
0 0 1 -1 0
0 0 0 0 1
0 0 0 0 0

1) Find a basis for the row space of A. What dimension is the row space?
2) Find a basis for the column space of A. What dimension is the column space?
3) Find a basis for the null space of A. What dimension is the null space?
4) What is the rank of A? What is the nullity of A?
5) Is the linear system Ax = b consistent for every b is an element of R4?
6) If the linear system Ax = b is consistent, how many solutions does it have, and how many parameters does it take to determine a solution?

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