Mathematics Part-II

Book: Mathematics Part-II

Chapter: 11. Three Dimensional Geometry

Subject: Maths - Class 12th

Q. No. 20 of Miscellaneous Exercise

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Find the vector equation of the line passing through the point (1, 2, – 4) and perpendicular to the two lines:

and .

The vector equation of a line passing through a point with position vector and parallel to a vector is

Given, the line passes through (1, 2, -4)


Given, line is parallel to both planes

Line is perpendicular to normal of both planes.

i.e is perpendicular to normal of both planes.

we know that -

is perpendicular to both &

So, is cross product of normals of planes


Required Normal


Now, putting the value of & in formula

Therefore, the equation of the line is


Chapter Exercises

More Exercise Questions


If the lines and are perpendicular, find the value of k.