COORDINATE GEOMETRY
these two lines to locate a point in a plane in this chapter, one line will be horizontal and the other will be vertical, as in Fig. 3.6(c). These lines are actually obtained as follows : Take two number lines, calling them X ′X and Y′Y. Place X ′X horizontal [as in Fig. 3.7(a)] and write the numbers on it just as written on the number line.
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