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यदि रेखा ax + by + c = 0 तथा 4x +5y+17 =...

यदि रेखा ax + by + c = 0 तथा 4x +5y+17 = 0 परस्पर लम्ब हों तो रेखा ax + by + c = 0 की प्रवणता ज्ञात कीजिए।

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The correct Answer is:
`5/4`
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