so you want a vector which passes through (2,0,0) and (2,0,λ)
Recall that the line through points with vectors a and b is just
r = a + λ(b-a)
where t is a scalar variable. So in this case,
r = 2i +λk
find the vector equation of line passing through the point 2,0,0 and parallel to line r=lambda k
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