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प्रश्न
The lines px + 5y + 7 = 0 and 2y = 5x - 6 are perpendicular to ach other. Find p.
उत्तर
Slope of px + 5y + 7 = 0 is `(-"p")/5`
Slope of 2y = 5x - 6 is `5/2`
Since the lines are given perpendicular to each other, the product of their slopes must be equal to -1.
`(-"p")/5 xx 5/2` = -1
`therefore` p = 2
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