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Answer: C. not defined

Answer: (C) not defined

A line parallel to the Y-axis makes an angle of 90° with the positive direction of the X-axis, and \(\tan 90^\circ\) is not defined. Also, any two points on it have the same x co-ordinate, so \(x_2 - x_1 = 0\) in the slope formula. Hence its slope cannot be determined.

Doubtly AI · 29 Oct 2026 AI-generated · not yet verified Report
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