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MCQ
For what value of k is the line y = kx + 5 perpendicular to the line through (1, 2) and (3, 4)?
Unit-8 Geometry of Straight Lines
A -1
B 1
C 2
D 5
Explanation

The given line has slope (4 - 2)/(3 - 1) = 1, so perpendicular slope is k = -1.

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