00:01
This time they want us to think about it.
00:02
What do they want to think about? well, what's a specific coordinate on a specific plane in space? so first, let me draw a regression of space.
00:14
So up and down will be our x -axis.
00:17
Let's go with that.
00:19
Let's say left and right are x -axis.
00:22
And now let's just say that going out of the screen and into the screen in this matter will be the y -axis, the positive and negative direction.
00:33
Okay.
00:34
Now they ask us, let's say we're a point on the xy plane.
00:38
If i were to depict the xy plane, it means we can't go up along the x -axis or down along the x -axis.
00:50
So they say, what must the coordinate be, the z -coordinate be of a point on the x -y plane? well, it's going to have to be zero, right? since you can't travel up or down, it must be zero here directly on the plane.
01:06
And now they can flip these little letters around to ask a similar question...