3. The slope of a line perpendicular to 13x-7y+1 = 0 is
13x-7y+1 = 0 సరళరేఖకు లంబంగా వుండు రేఖ వాలు
13
13
7
7
(1)
1
(2)
13
(3)
(4)
7
13
13
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