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12 May, 23:18

If a=i-2j and b = 2i - xj are parallel, then x is ...

a) 4 3 2) 2 d 4.

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Answers (1)
  1. 13 May, 02:19
    0
    x = 4

    Step-by-step explanation:

    a = i-2j

    b = 2i-xj

    1 = k•2

    -2 = k• (-x)

    => 1/2 = k

    => (-2) / (-x) = k

    => 1/2 = (-2) / (-x) = > 1/2 = 2/x = > x = 4
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