Answer
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Hint: Express the given system of equations in matrix form and find the determinant of the coefficients of x,y and z.
We will write given equations in the matrix form as $A.X = B$
Where $A = \left( {\begin{array}{*{20}{c}}
1&1&1 \\
5&{ - 1}&\mu \\
2&3&{ - 1}
\end{array}} \right)$ , \[X = \left( {\begin{array}{*{20}{c}}
x \\
y \\
z
\end{array}} \right)\] and \[B = \left( {\begin{array}{*{20}{c}}
\lambda \\
{10} \\
6
\end{array}} \right)\]
Now, we will find determinant of A i.e. $\left| A \right|$
\[
\left| A \right| = \left( {\begin{array}{*{20}{c}}
1&1&1 \\
5&{ - 1}&\mu \\
2&3&{ - 1}
\end{array}} \right) \\
\left| A \right| = 1\left( {1 - 3\mu } \right) - 1\left( { - 5 - 2\mu } \right) + 1\left( {15 + 2} \right) \\
\left| A \right| = 1 - 3\mu + 5 + 2\mu + 17 \\
\left| A \right| = 23 - \mu \\
\]
From the above equation, we can see that the uniqueness of the system depends only on $\mu $.
$\therefore $Correct option is A.
Note: In a practical case, a system of linear equations will have a unique solution if the lines
representing the equations intersect each other at only one unique point i.e. the lines are
neither parallel nor coincident.
We will write given equations in the matrix form as $A.X = B$
Where $A = \left( {\begin{array}{*{20}{c}}
1&1&1 \\
5&{ - 1}&\mu \\
2&3&{ - 1}
\end{array}} \right)$ , \[X = \left( {\begin{array}{*{20}{c}}
x \\
y \\
z
\end{array}} \right)\] and \[B = \left( {\begin{array}{*{20}{c}}
\lambda \\
{10} \\
6
\end{array}} \right)\]
Now, we will find determinant of A i.e. $\left| A \right|$
\[
\left| A \right| = \left( {\begin{array}{*{20}{c}}
1&1&1 \\
5&{ - 1}&\mu \\
2&3&{ - 1}
\end{array}} \right) \\
\left| A \right| = 1\left( {1 - 3\mu } \right) - 1\left( { - 5 - 2\mu } \right) + 1\left( {15 + 2} \right) \\
\left| A \right| = 1 - 3\mu + 5 + 2\mu + 17 \\
\left| A \right| = 23 - \mu \\
\]
From the above equation, we can see that the uniqueness of the system depends only on $\mu $.
$\therefore $Correct option is A.
Note: In a practical case, a system of linear equations will have a unique solution if the lines
representing the equations intersect each other at only one unique point i.e. the lines are
neither parallel nor coincident.
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