JEE Main & Advanced
Mathematics
Vector Algebra
Question Bank
Modulus of vector Algebra of vectors
question_answer
If the vectors \[3\,\mathbf{i}+2\,\mathbf{j}-\mathbf{k}\]and \[6\,\mathbf{i}-4x\mathbf{j}+y\mathbf{k}\] are parallel, then the value of x and y will be [RPET 1985, 86]
A)1, ? 2
B)1, ? 2
C)1, 2
D)1, 2
Correct Answer:
A
Solution :
Obviously, \[\frac{3}{6}=\frac{2}{-4x}=-\frac{1}{y}\Rightarrow x=-1\] and \[y=-2.\]