00:01
Here on this problem, we want to solve this system by gaussian elimination.
00:05
And so to do this, we need to make our coefficient metrics out of this.
00:10
And so our coefficients, we have 45, negative 6, 30, and 15.
00:19
And then i've got a 60 and a 63 .75 there on the right.
00:26
So now the first thing that i'm going to do, let row 2 equal 2 row 1 minus 3, row 2.
00:45
So i'm going to keep row one the same for now.
00:47
So i've got 45, negative 6, and 60.
00:52
Then on row 2, i take 90 minus 90.
00:56
That gives me 0.
00:58
I take negative 12 minus 45, and that gives me negative 57...