dy/dx = x/2
dy/dx = -4
if parallel x/2 = -4 so x = -8
if perpendicular x/2 = - (1/-4) = 1/4
so x = 1/2
two vectors are defined as a=2i+xj and b=i-4j. find value of x if
a) the vectors are parallel
b) the vectors are perpendicular
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