7. Given the two 4 x 4 lincar systems having the same coefficient matrix: XI -I + 21, - = 6, I- X + 21 - L = 1, -I +X = 4, I- As +4 = I, 2r, + 2 +3-4t, = -2. 21 ++3- 4L, = 2, --X2 +-X 5; -I +- =-1. a. Solve the lincar systems by applying Gaussian elimination to the augmented matrix I-1 2-1 6 1 -1 4 3. -4 -2 -1 -1 b. Solve the linear systems by finding and multiplying by the inverse of 1 -1 -1 1 -1 1 2 1 3 -4 -1 1 -1 Which method requires more operations? с.

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
Publisher:Jerome E. Kaufmann, Karen L. Schwitters
Chapter11: Systems Of Equations
Section11.5: Cramer's Rule
Problem 35PS
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7. Given the two 4 x 4 lincar systems having the same coefficient matrix:
XI - + 21, - = 6.
I-X2 +2-L = 1,
- I +X = 4,
I-Is +4 = I,
21 +2 +3X-4 = -2.
21 + +31-41 2,
-Xz +- X = 5;
-I +X- =-1.
a Solve the linear systems by applying Gaussian elimination to the augmented matrix
I-1
2.
-1
6.
0 -1
4
3.
-4
-2
-1
-1
-1
b. Solve the linear systems by finding and multiplying by the inverse of
1
-1
-1
1
-1
1
1
3
-4
-1
1
-1
c. Which method requires more operations?
Transcribed Image Text:7. Given the two 4 x 4 lincar systems having the same coefficient matrix: XI - + 21, - = 6. I-X2 +2-L = 1, - I +X = 4, I-Is +4 = I, 21 +2 +3X-4 = -2. 21 + +31-41 2, -Xz +- X = 5; -I +X- =-1. a Solve the linear systems by applying Gaussian elimination to the augmented matrix I-1 2. -1 6. 0 -1 4 3. -4 -2 -1 -1 -1 b. Solve the linear systems by finding and multiplying by the inverse of 1 -1 -1 1 -1 1 1 3 -4 -1 1 -1 c. Which method requires more operations?
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