AMAT 220 UA Linear Algebra Linear Transformation & Set of Vectors Exam Practice

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Name:
AMAT 220: Linear Algebra
Practice Exam
March, 2020
Show all work for each problem in the space provided. If you run out of room for an answer, continue on
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Question
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1. Define what both a linear transformation is and the span of a set of vectors.
2. Find the general solution of the linear system
3×1 − 4×2 + 2×3 = 0
(1)
−9×1 + 12×2 − 6×3 = 0
(2)
−6×1 + 8×2 − 4×3 = 0
(3)
OR
x1 − 7×2 + 6×4 = 5
x3 − 2×4 = −3
−x1 + 7×2 − 4×3 + 2×4 = 7
(4)
(5)
(6)
by row reducing the corresponding augmented matrix and interpreting your result in terms of the corresponding
linear system.
3. Show by computation whether the given vector b ∈ Span{a1 , a2 , . . . , an }, where ai are vectors. Specifically,
show whether


−9






b =  −7 




−15
is contained in the spanning set
 
 
 
2
1
3
 
 
 
 
 
 
 
 
 
Span{a1 = 1 a2 = −1 a3 = 2}
 
 
 
 
 
 
4
3
5
OR
 
9
 
 
 
b = 2
 
 
7
is contained in the spanning set
 
 
1
6
 
 
 
 
 
 
Span{a1 =  2  a2 = 4}
 
 
 
 
−1
2
4. Describe in parametric form all solutions of the system Ax = 0 for the given A.


2 1 3

A=
1 2 0
OR

3

A=
1

1 1

5 −1 1 1
5. Determine if the given set of vectors are linearly dependent:
 
 
 
 
−2
3
6
7
 
 
 
 
 
 
 
 
 
 
 
 
S = {a1 =  0  , a2 = 2 , a3 = −1 , a4 = 0}
 
 
 
 
 
 
 
 
1
5
1
2
OR
 
 
8
4
 
 
 
 
 
 
S = {a1 = −1 , a2 = 0}
 
 
 
 
3
1
6. Compute the standard matrix A associated to the given linear transformation T : Rn → Rm , where
T (x1 , x2 ) = (x1 + 2×2 , 3×1 − x2 )
OR
T (x1 , x2 , x3 ) = (2×1 − x2 + x3 , x2 − 4×3 )
7. Compute the matrix product AB for the given A and B.


1 2 4

A=
2 6 0
and


4 1 4 3






B = 0 −1 3 1




2 7 5 2
OR

6
1 3







A = −1 1 2




4 1 3
and

3
0







B = −1 2




1 1
8. Compute the inverse of the given matrix A by the algorithm for computing a matrix’s inverse; that is, row
reduce the matrix of A augmented by I.


1 2 3






A = 2 5 3




1 0 8
OR


3 4 −1






A = 1 0 3 




2 5 −4
9. Use your answer from the question 8. to find a solution x to the linear system
x1 + 2×2 + 3×3 = 7
(7)
2×1 + 5×2 + 3×3 = 5
(8)
x1 + 8×3 = 8
(9)
3×1 + 4×2 − x3 = 7
(10)
x1 + 3×3 = 5
(11)
2×1 + 5×2 − 4×3 = 8
(12)
RESPECTIVELY
Respectively means apply the inverse of the first answer in 8 to solve the first problem in this question and to
apply the second answer in 8 to solve the second problem in this question.

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