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If the system of equations  2x3y+4=0,5x2y1=0 and 21x8y+λ=0 is consistent , then λ  is 

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a
-1
b
1
c
0
d
-5

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detailed solution

Correct option is D

Given system of equation is consistent ⇒ Given equations has a solution.2x−3y+4=0,5x−2y−1=0⇒x=1,y=221x−8y+λ=0⇒21−16+λ=0⇒λ=−5


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