The straight line y = x - 2 rotates abou...

The straight line `y = x - 2` rotates about a point where it cuts x-axis and become perpendicular on the straight line `ax + by + c = 0` then its equation is

`ax+by+2a=0`

`ay-bx+2b=0`

`ax+by+2b=0`

None of these

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