2 Group 14
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Question 1.
The vector
(
a
,
-
1
)
is a linear combination of the vectors
(
1
,
4
)
,
(
-
4
,
-
16
)
if and only if
a)
a
=
4
b)
a
=
-
1
/
4
c)
a
=
-
4
d)
a
=
1
/
4
e)
a
∈
ℝ
Question 2.
For which
a
∈
ℝ
has the following system of linear equations no solution?
2
x
+
y
+
z
=
0
4
x
+
2
y
+
a
z
=
a
y
+
2
z
=
a
a)
a
=
-
1
b)
it has a solution for all
a
∈
ℝ
c)
a
=
3
d)
a
=
1
e)
a
=
2
Question 3.
Determine the rank of the matrix
(
1
,
-
2
,
3
,
4
-
3
,
0
,
4
,
5
-
1
,
-
4
,
10
,
13
)
.
a)
3
b)
1
c)
4
d)
2
e)
0
Evaluate