Solve the system of linear equations, using the Gauss-Jordan elimination

Motalli21

Motalli21

Answered question

2022-01-23

Utilize the Gauss-Jordan elimination method to solve the system of linear equations. (If there is no solution, enter NO SOLUTION. If there are infinitely many solutions, express your answer in terms of the parameters t and/or s.) 
x+2y+z=−4 
−2x−3y−z=2 
4x+8y+4z=−16

Answer & Explanation

seibesitoeu

seibesitoeu

Beginner2022-01-24Added 12 answers

We have given system of equations
x + 2y + z = −4
−2x − 3y − z = 24
x + 8y + 4z = −16
The augmented matrix of given system is
[121|4231|2484|16]
The pivot element in first row and first column is 1.
Now applying the following row transformations on augmented matrix.
R2R2+2R1
R3R34R1
[121|4011|6000|0]
The pivot element in second row and second coulmn is 1.
Apply following transformation on previous matrix.
R1R12R2
[101|8011|6000|0] Rewriting the system of equation from this row reduced matrix,
x − z=8y + z = −6 The number of equations = 2
Number of variables = 3
Number of variables is greater than number of equations hence given system has infinitely many solutions.
Number of free variables = Number of variables - Number of equations = 3 - 2 = 1
Substitute t for z.
x − t=8 and y + t = −6
x = t + 8 and y = −t −6
Therefore, x = t + 8, y = −t − 6 and z = t.
Answer: The given system has infinitely many solutions and the solution set is x = t + 8, y = −t − 6, z = t.

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