00:01
Okay, we want to solve the system of equations.
00:02
I'm going to do it with gaussian elimination.
00:15
Okay, first step is to get a 1, which you have.
00:18
So that's good.
00:19
Next step, get a 0 here.
00:21
And then the next step, get a 0 here.
00:25
So we'll leave the first row the way it is.
00:28
That should be minus 2 right there.
00:36
Take row 2 minus row 1 in row 2's place.
00:45
And then 3 row 1 plus row 3 in row 3's place.
00:53
3 row 1, 3 1, 3 1, 3 row 1.
01:00
Okay, next, we want to get a 0 1 right here.
01:07
So i'm going to get that by multiplying, minus 1ā2 in row 2's place.
01:21
Oops, positive 5.
01:35
Okay, so you can see that row 2 and row theory are just opposites of each other.
01:46
Okay, so the next thing you're going to do is get a 0 here, and then here.
01:49
But since they're opposites of each other, what's going to happen is they're going to just cancel each other out...