Book: Mathematics Part-II
Chapter: 10. Vector Algebra
Subject: Maths - Class 12th
Q. No. 11 of Exercise 10.2
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11
Show that the vectors 
are collinear.
We know that two vectors are collinear if they have the same direction or are parallel or anti-parallel. They can be expressed in the form 
where a and b are vectors and 'm' is a scalar quantity.
From the question,
Let 
and 
Here,
So,
where, m=-2.
∴ The given two vectors are collinear.
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