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MCQ
For what value of k are the lines y = 2x + 3 and y = kx - 1 perpendicular?
Unit-8 Geometry of Straight Lines
A 2
B -2
C 1/2
D -1/2
Explanation

Perpendicular lines satisfy m1*m2 = -1, so 2k = -1 and k = -1/2.

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