Prove that Product of Slopes of two perpendicular lines is 1 | Competitive maths

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Product of Slopes of two perpendicular lines is -1.
Competitive exams, class 10 maths, class 11 maths, class 12 maths

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If X-axis and y-axis are also perpendicular so what product of their slopes

srinivasjsv
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Sir agar vhan 90-B ki jagah 180-B lene pe and -1 nhi aa rha kyu

harshmishra