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If vector addition is not a problem, then neither will this.
Subtracting a vector is actually the same as adding a Negative
vector.
(s-t) is s+(-t), right?
But you're given t, not (-t). However, t and (-t) are the same except for their
opposite directions.
So, instead of connecting the tail of t to the head of s, connect the head of
t to the head of s.
In other words, you now walk along s and continue along the opposite direction
of t.
How about (-t)+s?
Move s and t, stretch them and change their direction. Then verify using the
s-t vector.
proceed to subtracting column vectors
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