求直线方程是解析几何的基本内容,尽管求直线方程通常情况下不会卡壳,但是熟练掌握求直线方程的思维策略,对于优化解题过程,提高思维能力具有明显效果.1直接法依据几何直观性,直接由题设条件求出直线上的两点坐标或直线的斜率与一点坐标是求直线方程的最基本的思路.例1直线l经 Seeking the equation of the line is the basic content of analytical geometry. Although the linear equation is usually not stuck, it is skillful to master the strategy of solving the linear equation. It has obvious effect on optimizing the problem solving process and improving the thinking ability.1 The direct method is based on geometrical visual Sex, directly from the title setting conditions to find the two-point coordinates of the straight line or the slope of a straight line and a point coordinate is the basic idea of ​​the linear equation. Example 1 Line l by