Help with the hw would be greatMichael Chiu
Math3CA1M12Jaramillo
WeBWorK assignment number HW
8 is due : 07/28/2012 at 11:59pm PDT.
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1.
(1 pt)
Write the system of equations in matrixvector form, then
write the augmented matrix of the system.
3
i
+
3
j
+
4
k
+
3
l
=
5
2
i

4
j
+
3
k
=
2
±
²
?
?
?
?
?
?
?
?
=
±
²
±
²
2.
(1 pt)
Write the system of equations in matrixvector form, then
write the augmented matrix of the system.
5
w
+
5
x

2
y
=
0
³
´
?
?
?
?
=
³
´
³
´
3.
(1 pt)
Consider the matrix
±
1
0
2
0
0
1
²
Which condition or conditions of being in RREF does the
matrix fail?
•
A. Zero rows are at the bottom
•
B. The leftmost nonzero entry of each nonzero row
equals 1
•
C. Each pivot is further to the right than the pivot in the
row above it
•
D. Each pivot is the only nonzero entry in its column
•
E. None of the above, it is in RREF
4.
(1 pt)
Consider the matrix
?
?
0
5
8
0
2
2
0
6
6
?
?
Which condition or conditions of being in RREF does the
matrix fail?
•
A. Zero rows are at the bottom
•
B. The leftmost nonzero entry of each nonzero row
equals 1
•
C. Each pivot is further to the right than the pivot in the
row above it
•
D. Each pivot is the only nonzero entry in its column
•
E. None of the above, it is in RREF
5.
(1 pt)
Consider the matrix
?
?
1
10
7
0
0
0
0
0
0
?
?
Which condition or conditions of being in RREF does the
matrix fail?
•
A. Zero rows are at the bottom
•
B. The leftmost nonzero entry of each nonzero row
equals 1
•
C. Each pivot is further to the right than the pivot in the
row above it
•
D. Each pivot is the only nonzero entry in its column
•
E. None of the above, it is in RREF
1
Answer