if slope of line is zero then___a)line is perpendicular to x-axis b) either the line is y-axis or it is parallel to y-axis. c) either the line is x-axis or it is parallel to x-axis. d)none of these.
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your answer is (C)
slope become 0 if only ine is x axis or parlell to x axis
angle b/w line and x axis is 0 so tan 0 = 0
then slope = 0
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