A vector can be represented by a line segment ... X is the midpoint of AB, Y is the midpoint of BC and Z is the midpoint of AC. Write, in terms of \(\mathbf{a}\), \(\mathbf{b}\) ...
If we move 'backwards' along a vector, it becomes negative, so a becomes -a. Moving from B to A entails moving 3 units to the left, and 4 down. So the three ways to write this vector are ...
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