Why use point-slope form?

It is the fastest form when a slope and one point are known.

Is point-slope form the same line as slope-intercept form?

Yes. They are equivalent forms of the same line.

根据斜率和一个点把直线写成点斜式，然后转换为斜截式。

斜率 mx1y1

答案

y - 5 = 3(x - 2)

当你知道一个斜率和一个点时，点斜式很有用。它在化简为 y = mx + b 之前展示直线方程。

y - y1 = m(x - x1)。

题目: m = 3, point (2, 5)

解答: y - 5 = 3(x - 2)，化简为 y = 3x - 1。