freeCodeCamp/guide/chinese/mathematics/point-slope-equation-of-a-line/index.md

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---
title: Point Slope Equation of a Line
localeTitle: 一条线的点斜率方程
---
## 一条线的点斜率方程
对于线性方程点斜率是y-y 1 = mx-x 1的一般形式。
它强调线的斜率和线上的一个点不是y轴截距
![点斜率方程](https://www.mathsisfun.com/data/images/graph-point-slope-a.gif)
## 求导
线Axy和Bx 1y 1上的任何两个点总是在同一斜率上。假设A是同一行上的任意点。 'm'被定义为线的斜率和线与正x轴的角度的正切。 两点之间的线的斜率由下式给出:
m =y - y 1/x - x 1
对于这种情况其中m是线的斜率 简化我们得到 的y Y 1 = MX-X 1
#### 更多信息:
\- [可汗学院:点坡度方程](https://www.khanacademy.org/math/algebra/two-var-linear-equations/point-slope/v/idea-behind-point-slope-form)