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

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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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) What is the rank of A? What is the nullity of A?
2) Is the linear system Ax = b consistent for every b is an element of R4?
3)  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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