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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 \[y=-2.\]          


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