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Question

The value of λ for which the system of equations x+y2z=0,2x3y+z=0,x5y+4z=λ is consistent is

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Solution

The given system is:
x5y+4z=λ
x+y2z=0
2x3y+z=0

Δ=∣ ∣154112231∣ ∣
C1C1+C2+C3
=∣ ∣054012031∣ ∣=0

Hence, system is consistant only whenΔx=Δy=Δz=0.
Δx=∣ ∣λ54012031∣ ∣=5λ=0
λ=0
For λ=0 clearly Δy=Δz=0.
Therefore, system is consistent if λ=0.

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