00:01
Okay, so let's get started with the first part of our exercise.
00:05
Well, here we have a general point with coordinates x and y, and we are reflecting this point through the x1 axis first.
00:17
Now, what is the reflection of this point? well, the reflection of this point is going to be x, negative y.
00:28
Now, if we reflect this point through the x2 axis, then what are we going to get? well, we are going to get the same y coordinate, and the x coordinate is going to be multiplied by negative 1.
00:47
So, we are going to have negative x, negative y.
00:50
Perfect.
00:51
Well, our transformation t takes x, y to this vector, negative x, negative y.
01:01
So, t is going to be the matrix, negative 1, 0, 0, negative 1...
