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If two lines are perpendicular, then the product of their slopes must be -1.
m1 × m2 = -1.
Hence, option 4 is the correct option.
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The equation of the straight line passing through the point (1, 2) and parallel to the line y = 3x + 1, is:
x – 3y + 1 = 0
3x + y + 1 = 0
3x – y – 1 = 0
3x – y + 1 = 0