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**Please help! Parametic vector equation??**

My lecturer is incredibly hard to understand and I have NO idea how to do this assignment. If someone could help me with this first question I think I might be able to do the rest by myself:

A) Find a parametric vector equation for the line through the points (2,4,1) and (8,-2,4)

B) find both unit direction vectors for the same line

Please show working and explain best you can how your doing it. I'm trying really hard in this course but the lecturer just writes on the black board without taking time to make sure anyone understand its :|