Answer :
Given:
Line ax – by + c = 0 and point (1, 1)
To prove:
Concept Used:
Distance of a point from a line.
Explanation:
The distance of the point (1, 1) from the straight line ax − by + c = 0 is 1
∴ 1
⇒ a2 + b2 + c2 – 2ab + 2ac – 2bc = a2 + b2
⇒ ab + bc – ac 
Dividing both the sides by abc, we get:
Hence proved.
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