MathematicsCoordinate geometryJAMB
The lines y = 2x + 3 and y = kx − 1 are perpendicular. Find k.
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Answer: D. −½
Perpendicular gradients multiply to −1: 2k = −1, so k = −½.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.