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Questions  

If a, b, c are in A.P., then ax+by+c=0 represents

a
a single line
b
a family of concurrent lines
c
a family of parallel lines
d
none of these

detailed solution

Correct option is B

ax+(a+c)2y+c=0a(2x+y)+c(y+2)=0which represents a family of lines passing through the intersection of 2x+y=0 and y+2=0

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If the lines ax+by+c = 0, bx+cy+a = 0 and cx+ay+b=0  abc are concurrent then the point of concurrency is


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