NDA Math Coordinate System and Straight Line

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Question : 62 of 92
 
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If (a, b) is at unit distance from the line 8x+6y+1=0, then which of the following conditions are correct?
1. 3a−4b−4=0
2.8a+6b+11=0
3. 8a+6b−9=0
Select the correct answer using the code given below:
[NDA II 2016]
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