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How is the motion of coordinate axis expressed mathematically?
The standard representation in mathematics is that the horizontal axis is X axis and the number axis is Y axis. There is a certain relationship between the two. As one axis changes, the other axis will change accordingly. And there will be a positive comparison or mutual comparison between the two. It may get bigger as one of the numbers gets bigger, or it may get smaller as one of the numbers gets bigger. In short, it has a certain relationship.