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 `

`ax - by - 2a = 0 `

`bx + ay - 2b = 0 `

`ay - bx + 2b = 0 `

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