find the slope of a line segment perpendicular to a segment with the given slope

问题描述:

find the slope of a line segment perpendicular to a segment with the given slope
有人知道这是什么意思么···
a) 2/3

slope=斜率,就是一条线,y=mx+c中,那个m
perpendicular=垂直(之间角度-90度)/正交
所以告诉你,一条线(line segment)斜率是X,求另一条对这条线垂直的线它的斜率
我们知道,两条垂直的线,他们的斜率乘起来是-1 (m1m2 = -1)
所以一个是 2/3,另一个不知道,我们先称为m
(2/3)m = -1
m = -1/(2/3)
m = -1*(3/2)
m = -1.5