摘要
When a particle moves on the plane,it can be described uncounted points corresponding to coordinates in a Cartesian coordinate system with the same unit on the each axis.However,not all the processes are convenient to express y in terms x.At times a relationship between x and y in terms of a third variable which is a various time t,is mexessary.
When a particle moves on the plane, it can be described uncounted points corresponding to coordinates in a Cartesian coordinate system with the same unit on the each axis. However, not all the processes are convenient to express y in terms x.
