What stays the[b] same[/b] and what [b]changes[/b] as you move the points around?[br]What happens when you change the value of m using the slider?[br]Are there any points that do not move under this transformation?[br]Where would the co-ordinate (x,y) map to?[br][br]随着点的移动，什么保持不变，什么改变？[br] 使用滑块更改m的值会怎样？[br] 在此转换过程中，有没有要解决的问题？[br] 坐标（x，y）会映射到哪里？[br]

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