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Class 1, Grade 9, Math Exercise 24.6( 1).
It is known that there is a line segment AB in the plane rectangular coordinate system, where a (1, 3) b (4, 5). If the vertical coordinates of point A and point B remain unchanged, the horizontal coordinate will be doubled, and the line segment AB _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. If the vertical coordinates of point A and point B remain unchanged, the horizontal coordinate will become original.