00:04
So looking at this system of equations, we'll start by writing it as a matrix.
00:10
So we have 0 -1 -5 -7, 3 -2 -0 -0 -12, and then 3 -0 -10 -80.
00:29
So right off the bat here, we want to work on getting those leading ones.
00:37
So we'll move the top row down to the middle, just some repositioning there.
00:44
And then what we'll do is move the middle to the top, 3, 2, 0, and 12.
00:54
And then we'll add a negative of the top row to the bottom row.
00:58
So this will give us 0, negative 2, 10, 68...