在直角坐标系中,利用参数法求轨迹方程,一般有两种方法:一是直接寻找轨迹上任意一点的横坐标x与纵坐标y与参数t的直接联系x=f(t),y=g(t);二是将动点看作受某一参数所确定的两条直线的交点,再从这两条含参数的直线方程 In the Cartesian coordinate system, using the parametric method to obtain the trajectory equation, there are generally two methods: one is to directly find the abscissa x at any point on the trajectory and the direct relation between the ordinate y and the parameter t x=f(t), y= g(t); The second is to consider the moving point as the intersection of two lines determined by a certain parameter, and then from these two linear equations with parameters