If a, b, c are in A.P., then prove that the straightline ax + by+c 0 w – InterviewSolution

1.

If a, b, c are in A.P., then prove that the straightline ax + by+c 0 will always pass through thepoint (1,-2)

Answer»

a,b,c are in A.P then

a+c=2b

=>a−2b+c=0

=>ax+by+c=0by comparing we can see the cofficient of a and b

it passes through(1,−2)

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