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Q.

If x-y+1=0 and px+qy+r=0 are dependent lines then   p+r+2q=

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a

-1

b

2

c

1

d

0

answer is D.

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Detailed Solution

Given x-y+1=0
px+qy+r=0 are dependent lines
 i.e., a1a2=b1b2=c1c21p=1q=1r1p=1q,1p=1rq=p;r=pp+r+2q=p+p+2(p) =2p2p=0

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If x-y+1=0 and px+qy+r=0 are dependent lines then   p+r+2q=