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If the lines ax+y+1=0, x+by+1=0 and x+y+c=0 (a,b and c being distinct and different from 1) are concurrent the value of `(a)/(a-1)+(b)/(b-1)+(c)/(c-1)` is

A

`-2`

B

`-1`

C

1

D

2

Text Solution

Verified by Experts

The correct Answer is:
C
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ARIHANT MATHS ENGLISH-THE STRAIGHT LINES-Exercise For Session 3
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  6. If u=a1x+b1y+c1=0,v=a2x+b2y+c2=0, and (a1)/(a2)=(b1)/(b2)=(c1)/(c2), t...

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  7. The straight lines x+2y-9=0,3x+5y-5=0 , and a x+b y-1=0 are concurrent...

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  8. If the straight lines x+y-2=0,2x-y+1=0 and a x+b y-c=0 are concurrent,...

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  9. If the equations of three sides of a triangle are x+y=1, 3x + 5y = 2 a...

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  10. Find the equations of the line through the intersection of 2x - 3y + 4...

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  11. The locus of point of intersection of the lines x/a-y/b=m and x/a+y/b...

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  12. The condition on aa n db , such that the portion of the line a x+b y-1...

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  13. If the lines (a-b-c) x + 2ay + 2a = 0 , 2bx + ( b- c - a) y + 2b = 0 a...

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  14. Prove that the lines ax+by + c = 0, bx+ cy + a = 0 and cx+ay+b=0 are ...

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  15. Find the equation of the straight line which passes through the inte...

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  16. Let a ,\ b ,\ c be parameters. Then the equation a x+b y+c=0 will repr...

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