直线方程的四种形式(点斜式、斜截式、两点式、截距式)均有各自的适用范围:点斜式、斜截式适用于斜率存在的情形,而截距式要求直线纵、横截距均存在且不为零,两点式适用于直线的斜率存在且不为零.当已知直线过两已知点时,其方程简单易求,不会存在什么问题.而在使用直线方程的点 The four forms of the linear equation (point-oblique, oblique-cut, two-point, and intercept) all have their own scope of application: point-inclined, oblique-cut is applicable to the presence of a slope, and intercept requires a straight line Both longitudinal and transverse dimensions exist and are not zero. The two-point type applies to the straight line where the slope exists and is not zero. When the straight line is known to cross two known points, the equation is simple and easy to find, and there is no problem. In the point of using the linear equation