00:01
So first for this, we're going to plot points a, which is 03, and then point b, which is 4 -1, and then we have o, which is the origin.
00:13
We're going to rotate both of these 270 degrees.
00:19
So b prime would be right here, and a would be right here.
00:31
So the slope of ab is negative to 4, which is negative a half, and then the slope of a b is negative, slope of a prime b prime is 4 over 2, which equals 2.
00:56
So that means that they, again, are opposite reciprocals, and they are perpendicular to each other...