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Intermediate Algebra Skill
Solving 3 x 3 Linear System by Gaussian Elimination
Solve the following Linear Systems of Equations by Gaussian Elimination:
4 x + 2 y − 6 z = 34

1) 2 x + y + 3z = 3
6 x + 3 y − 3z = 37

2 x − 4 y + z = 10

8)  x + 2 y − z = 1
− x − 3 y + 2 z = 0

3x − y + z = −1

2) 2 x + 3 y + z = 4
5 x + 4 y + 2 z = 5

3x + y − z = 4

9)  x + 2 y + 2 z = 5
4 x + y − z = 3

2 x + y + z = −2

3) 2 x − y + 3z = 6
3x − 5 y + 4 z = 7

5 x + 6 y − 5 z = −1

10) 3x − 4 y − 3z = 7
−2 x + 5 y + z = −4

6 x + 2 y − 4 z = 15

4) −3x − 4 y + 2 z = −6
4 x − 6 y + 3z = 8

 2 x + 3z = 1

11) 3x − 5 y = 10
4 y − 3z = 13

3x + 3z = 0

5) 2 x + 2 y = 2
3 y + 3z = 3

3 y + 4 z = 6

12) 3x − 5 z = 3
2 x + 5 y = 2

 x + 3 y − 3z = 12

6) 3x − y + 4 z = 0
− x + 2 y − z = 1

1
1
2 x + 3 y = 4

1
1
13)  y − z = 1
4
2
1
1
4 x + 2 z = 5

x + y + z = 3

7) 2 x − y − z = 0
 x + 2 y − z = −1

1
1
 3 x − 3 z = −2

1
1
14)  y + z = 7
3
6
2
1
3 x + 4 y = 9

Intermediate Algebra Skill
Answers to Solving 3 x 3 Linear System by Gaussian Elimination
1) ( Dependent )
2) ( −1,1,3)
3) ( −3,0,4)


4)  2, − 1 , −1
2 

5) ( 0,1,0)
6) ( 3,1, −2)
7) (1,0,2 )
8) (3, −1,0 )
9) ( −1,5, −2)
10) ( −2, −1, −3)
11) ( 5,1, −3)
12) ( 6, −2,3)
13) ( 4,6,8)
14) ( 9,12,15)
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