CUET · MATHS · PYQ PAPER 2025
The following system of equations \(2 x-y+3 z=5,3 x+2 y-z=7,4 x+5 y-\lambda z=\mu\) is consistent. Then
- A \(\lambda=5\) and \(\mu \neq 9\)
- B \(\lambda \neq 9\) and \(\mu=5\)
- C \(\lambda=5\) and \(\mu=9\)
- D \(\lambda=5\) and \(\mu=5\)
Answer & Solution
Correct Answer
(C) \(\lambda=5\) and \(\mu=9\)
Step-by-step Solution
Detailed explanation
\( \begin{vmatrix} 2 & -1 & 3 \\ 3 & 2 & -1 \\ 4 & 5 & -\lambda \end{vmatrix} = 2(-2\lambda+5) + 1(-3\lambda+4) + 3(15-8) = -4\lambda+10-3\lambda+4+21 = -7\lambda+35 \) For consistency when \( \text{det}(A)=0 \): \( -7\lambda+35=0 \Rightarrow \lambda=5 \) With \( \lambda=5 \),…
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