00:01
So we have point a at negative 3, positive 7.
00:09
Here's point a.
00:11
Point b is located at positive 9, positive 5.
00:33
So here's b.
00:35
And we have us, we want to know what is the reflection line so that we obtain a1b1.
00:57
So a prime is at, 1, 2, 3, negative 3, negative 1.
01:07
That's at negative 3, negative 1.
01:10
And b prime is at 9 positive 1.
01:18
So that's 9, 5, and that's negative 3, 7.
01:24
So the first one is the line y equals x.
01:30
If we're reflecting over the line y equals x, then the xy point becomes y x.
01:40
So in other words, if a is at negative 3 ,7, a prime would have to be at 7 negative 3.
01:49
And it's not.
01:50
So it's not y equals x...