If 4a+5b+6c=0 then the set of lines ax+by+c=0 are concurrent at the point
A
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B
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C
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D
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Solution
The correct option is A
4a+5b+6c=0 (6x)a+(6y)b+6c=0 → [Multiply given set of lines ax+by+c=0 with '6'] Now on comparing 6x=4 and 6y =5 ⇒ (x,y) = (23,56) ∴ ax+by+c=0 must passes through (23,56)