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If one vector is a multiple of another vector, then the two vectors must be parallel. And: If one vector is a multiple of another vector and they have a point in common, then the two vectors must form a straight line. y 0 x 5 10 15 5 10 15 20 B E p F G J p K p L M 2p P Q p S R –p 1 2 y 0 x 5 10 15 5 10 15 20 B E p T q p + q
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