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What is the slope of a line which is parallel to y-axis?(a) -1(b) 0(c) 1(d) Not definedI have been asked this question in an online interview.The above asked question is from Slope of a Line topic in chapter Straight Lines of Mathematics – Class 11

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Right answer is (d) Not DEFINED

Best EXPLANATION: If a line is parallel to y-axis then angle formed by it with x-axis is zero. So, its inclination is 90°. Hence SLOPE = tan 90° which is not defined.



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