College Algebra MA 240 Online Exam 7.Question 1 of 40
2.5/ 2.5 Points
Solve the following system of equations using matrices. Use Gaussian elimination with back
substitution or Gauss-Jordan elimination.
2x - y - z = 4
x + y - 5z = -4
x - 2y = 4
A. {(2, -1, 1)}
B. {(-2, -3, 0)}
�...
solve the following system of equations using matrices use gaussian elimination with back substitution or gauss jordan elimination
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MA 240
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College Algebra MA 240
Online Exam 7_06
33769 Online Exam 7_06
Part 1 of 2 - Lesson 6 Questions 47.5/ 50.0 Points
Question 1 of 40
2.5/ 2.5 Points
Solve the following system of equations using matrices. Use Gaussian elimination with back
substitution or Gauss-Jordan elimination.
2x - y - z = 4
x + y - 5z = -4
x - 2y = 4
A. {(2, -1, 1)}
B. {(-2, -3, 0)}
C. {(3, -1, 2)}
D. {(3, -1, 0)}
Question 2 of 40
2.5/ 2.5 Points
Use Cramer’s Rule to solve the following system.
,College Algebra MA 240
12x + 3y = 15
2x - 3y = 13
A. {(2, -3)}
B. {(1, 3)}
C. {(3, -5)}
D. {(1, -7)}
Question 3 of 40
2.5/ 2.5 Points
Use Gauss-Jordan elimination to solve the system.
-x - y - z = 1
4x + 5y = 0
y - 3z = 0
A. {(14, -10, -3)}
,College Algebra MA 240
B. {(10, -2, -6)}
C. {(15, -12, -4)}
D. {(11, -13, -4)}
Question 4 of 40
2.5/ 2.5 Points
Give the order of the following matrix; if A = [aij], identify a32 and a23.
1 -5 ∏ e
0 7 -6 -∏
-2 1/2 11 -1/5
A. 3 * 4; a32 = 1/45; a23 = 6
B. 3 * 4; a32 = 1/2; a23 = -6
, College Algebra MA 240
C. 3 * 2; a32 = 1/3; a23 = -5
D. 2 * 3; a32 = 1/4; a23 = 4
Question 5 of 40
2.5/ 2.5 Points
Use Gaussian elimination to find the complete solution to the following system of equations, or
show that none exists.
w - 2x - y - 3z = -9
w+x-y=0
3w + 4x + z = 6
2x - 2y + z = 3
A. {(-1, 2, 1, 1)}
B. {(-2, 2, 0, 1)}
C. {(0, 1, 1, 3)}
D. {(-1, 2, 1, 1)}
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