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Cheney and Kincaid - Linear Algebra 2/e (Homework)

James Finch

Math - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 5 / 13

Due : Sunday, January 27, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6 7
1/1 1/4 1/1 –/3 –/2 1/1 1/1
Total
5/13 (38.5%)

  • Instructions

    Here are some textbook questions from Linear Algebra 2/e by Ward Cheney and David Kincaid published by Jones & Bartlett Learning. Click here for a list of all of the questions coded in WebAssign. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

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1. 1/1 points  |  Previous Answers CheneyLinAlg2 1.1.012. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Solve this system:
3x1 + 6x2 + 3x3 = 15
2x1 + 4x2 + 6x3 = 18
2x1 + 5x2 + 6x3 = 21
.

(x1, x2, x3) = 
−3,3,2
Correct: Your answer is correct.
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2. 1/4 points  |  Previous Answers CheneyLinAlg2 1.1.020. My Notes
Question Part
Points
Submissions Used
1 2 3 4
0/1 1/1 –/1 –/1
3/50 3/50 0/50 0/50
Total
1/4
 
Find the reduced row echelon forms of these matrices.
(a)    
0305
400−3
0016
8315

 Incorrect: Your answer is incorrect.
(b)    
−120−13
1631−1
20322
12312
(c)    
31
42
−90
(d)    
34−9
120
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3. 1/1 points  |  Previous Answers CheneyLinAlg2 1.2.021. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Let
ln x30 + y2 = 65
ln x2 + 6y2 = 34
.


Solve this system for x and y. The logarithms are based on e = 2.71828....
(x, y) = 
e2,√5
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4. –/3 points CheneyLinAlg2 1.2.044. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
Total
–/3
 
Express each of these as a single vector.
(a)    
52
13
 
1
−1

(b)    
204
130
015
 
1
−2
1
(c)    
1
3
4
 − 3
2
1
0
 + 3
3
3
3
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5. –/2 points CheneyLinAlg2 1.3.004. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/50 0/50
Total
–/2
 
For the matrix shown here, compute its rank.
14−318
3113−1
2266
13−113


Find a set of vectors whose span is its kernel.
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6. 1/1 points  |  Previous Answers CheneyLinAlg2 1.3.006. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Find a matrix whose kernel is spanned by the two vectors
u = (1, 3, 7)
 and
v = (−2, 0, −6).


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7. 1/1 points  |  Previous Answers CheneyLinAlg2 1.3.017. My Notes
Question Part
Points
Submissions Used
1
1/1
1/50
Total
1/1
 
Determine whether this is true.
130504
261805
262619
 ~ 
130504
001−20−3
000017
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