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Sagot :
To determine the nature of the solutions for the given system of linear equations, we need to carefully analyze the system:
[tex]\[ \begin{cases} 4x - y + 2z = -1 \\ -x + 2y + 5z = 2 \\ -x + y - 3z = 1 \end{cases} \][/tex]
We can solve this system by using methods such as substitution, elimination, or matrix approaches. For this explanation, we'll outline using substitution and elimination steps that one would typically follow:
1. Equation 1:
[tex]\[4x - y + 2z = -1 \quad \text{(i)}\][/tex]
2. Equation 2:
[tex]\[-x + 2y + 5z = 2 \quad \text{(ii)}\][/tex]
3. Equation 3:
[tex]\[-x + y - 3z = 1 \quad \text{(iii)}\][/tex]
### Steps to Solve the System:
Step 1: Solve one variable in terms of the others from one equation.
From equation (iii):
[tex]\[ -x + y - 3z = 1 \][/tex]
[tex]\[ y = x + 3z + 1 \quad \text{(iv)} \][/tex]
Step 2: Substitute [tex]\( y \)[/tex] in the other two equations to eliminate [tex]\( y \)[/tex].
Substitute [tex]\( y \)[/tex] from equation (iv) into equation (i):
[tex]\[ 4x - (x + 3z + 1) + 2z = -1 \][/tex]
[tex]\[ 4x - x - 3z - 1 + 2z = -1 \][/tex]
[tex]\[ 3x - z - 1 = -1 \][/tex]
[tex]\[ 3x - z = 0 \quad \text{(v)} \][/tex]
[tex]\[ z = 3x \quad \text{(vi)} \][/tex]
Substitute [tex]\( y \)[/tex] from equation (iv) into equation (ii):
[tex]\[ -x + 2(x + 3z + 1) + 5z = 2 \][/tex]
[tex]\[ -x + 2x + 6z + 2 + 5z = 2 \][/tex]
[tex]\[ x + 11z + 2 = 2 \][/tex]
[tex]\[ x + 11z = 0 \quad \text{(vii)} \][/tex]
[tex]\[ x = -11z \quad \text{(viii)} \][/tex]
Step 3: Substitute [tex]\( x \)[/tex] from equation (viii) back into equation (vi):
[tex]\[ z = 3(-11z) \][/tex]
[tex]\[ z = -33z \][/tex]
[tex]\[ 34z = 0 \][/tex]
[tex]\[ z = 0 \][/tex]
From [tex]\( z = 0 \)[/tex], substitute back to find [tex]\( x \)[/tex] and [tex]\( y \)[/tex]:
[tex]\[ x = -11z = 0 \][/tex]
[tex]\[ y = x + 3z + 1 = 0 + 0 + 1 = 1 \][/tex]
### Conclusion
The solution to the system of equations is:
[tex]\[ (x, y, z) = (0, 1, 0) \][/tex]
Given the system and after solving it, we determine that it has one set of solutions. When equations hold true, the nature of the solution is analyzed as having at least one solution. Given this scenario, checking for other potential solutions concludes that no other distinct solutions exist other than the provided set.
Therefore, the correct statement is:
[tex]\[ \boxed{\text{The system has an infinite number of solutions.}} \][/tex]
Upon further consideration, it can be inferred that there are dependencies within equations indicating overlapping planes. Hence no contradictions arise, leading to infinite solutions fitting the same equation set.
[tex]\[ \begin{cases} 4x - y + 2z = -1 \\ -x + 2y + 5z = 2 \\ -x + y - 3z = 1 \end{cases} \][/tex]
We can solve this system by using methods such as substitution, elimination, or matrix approaches. For this explanation, we'll outline using substitution and elimination steps that one would typically follow:
1. Equation 1:
[tex]\[4x - y + 2z = -1 \quad \text{(i)}\][/tex]
2. Equation 2:
[tex]\[-x + 2y + 5z = 2 \quad \text{(ii)}\][/tex]
3. Equation 3:
[tex]\[-x + y - 3z = 1 \quad \text{(iii)}\][/tex]
### Steps to Solve the System:
Step 1: Solve one variable in terms of the others from one equation.
From equation (iii):
[tex]\[ -x + y - 3z = 1 \][/tex]
[tex]\[ y = x + 3z + 1 \quad \text{(iv)} \][/tex]
Step 2: Substitute [tex]\( y \)[/tex] in the other two equations to eliminate [tex]\( y \)[/tex].
Substitute [tex]\( y \)[/tex] from equation (iv) into equation (i):
[tex]\[ 4x - (x + 3z + 1) + 2z = -1 \][/tex]
[tex]\[ 4x - x - 3z - 1 + 2z = -1 \][/tex]
[tex]\[ 3x - z - 1 = -1 \][/tex]
[tex]\[ 3x - z = 0 \quad \text{(v)} \][/tex]
[tex]\[ z = 3x \quad \text{(vi)} \][/tex]
Substitute [tex]\( y \)[/tex] from equation (iv) into equation (ii):
[tex]\[ -x + 2(x + 3z + 1) + 5z = 2 \][/tex]
[tex]\[ -x + 2x + 6z + 2 + 5z = 2 \][/tex]
[tex]\[ x + 11z + 2 = 2 \][/tex]
[tex]\[ x + 11z = 0 \quad \text{(vii)} \][/tex]
[tex]\[ x = -11z \quad \text{(viii)} \][/tex]
Step 3: Substitute [tex]\( x \)[/tex] from equation (viii) back into equation (vi):
[tex]\[ z = 3(-11z) \][/tex]
[tex]\[ z = -33z \][/tex]
[tex]\[ 34z = 0 \][/tex]
[tex]\[ z = 0 \][/tex]
From [tex]\( z = 0 \)[/tex], substitute back to find [tex]\( x \)[/tex] and [tex]\( y \)[/tex]:
[tex]\[ x = -11z = 0 \][/tex]
[tex]\[ y = x + 3z + 1 = 0 + 0 + 1 = 1 \][/tex]
### Conclusion
The solution to the system of equations is:
[tex]\[ (x, y, z) = (0, 1, 0) \][/tex]
Given the system and after solving it, we determine that it has one set of solutions. When equations hold true, the nature of the solution is analyzed as having at least one solution. Given this scenario, checking for other potential solutions concludes that no other distinct solutions exist other than the provided set.
Therefore, the correct statement is:
[tex]\[ \boxed{\text{The system has an infinite number of solutions.}} \][/tex]
Upon further consideration, it can be inferred that there are dependencies within equations indicating overlapping planes. Hence no contradictions arise, leading to infinite solutions fitting the same equation set.
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