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Question 8
Use Gauss-Jordan elimination (row operations) to determine the number of solutions of the
following system. For which
k
is there a unique solution? in±nitely many? none?
⎧
⎨
⎩
x
+
y
+
z
=1
x
+2
y
+
kz
=2
x
+4
y
+
k
2
z
=3
Question 9.
Find a matrix
A
so that
A
·
⎛
⎝
0
0
1
⎞
⎠

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