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Co-ordinate Geometry — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSCo-ordinate Geometry1 Mark
Question
Write the slope of the line which is: Parallel to the $ y-$axis.
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Answer

For any line which is parallel to $y-$axis, the inclination is $\theta = 90^\circ $
Therefore$,$ Slope$(m) = \tan \theta = \tan 90^\circ = \infty ($not defined$).$

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