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If 2a + b + 2c = 0 then the family of lines ax+by+c=0 is concurrent at...?
U can divide the whole eqn. 2a + b + 2c by 2 also.we get,a + b/2 + c = 0now compare it with ax+by+c=0and we getx = 1 b =0.5 hence.
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