Row 2 minus row 1.

So the second row minus the first row.

Just replace this row with this row plus the first row.

Let's replace this row with this row minus 2 times that row.

Let me replace the second row with 2 times the first row minus the second row.

And then row 2 minus row 1.

The third row minus 3 times the first row.

Well, this was one row, and this is the second row, this is the third row, and this is the fourth row.

It's the third row minus 3 times the first row.

This row is the same as this row.

And I didn't touch on it in that video, but there is also such a thing as a lower triangular, that you might have guessed how it looks.

And let's replace our second row with the second row minus the first row.

What I could do is I can replace this row with this row minus this row.

So what's the third row minus the first row?

I'm going to subtract 2 times row two from row three.

Get in a line, lady, get in a line please.

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So I'm replacing the top row with the top row minus the third row.

And let's replace my first row with the first row plus the second row.

I'm replacing the first row with the first row minus the second row.

And let me replace this last row with the last row minus the middle row.

Because this row, row 1, column 2.

So the first row well, I won't even write the first row.

I'm going to replace the second row with the second row plus the first row.

Now the second row, I'm going to replace it with the first row minus the second row.

What I'm going to do is, this row minus 2 times the first row.

Keep the whole first row the same. Let's replace the second row with the second row plus the first row.

And let's do it by replacing our blue row, our third row, with the third row minus 2 times the second row.

So then my third row now becomes what the second row was here.

Now, let's replace our first row with the first row minus the third row.

And let me replace row 1 with row 1 minus 2 times row 2.

So let me replace the third row with the third row minus 2 times the second row.

So, what is that? That is in the second row. It's in row two.

So let me replace my third row with my third row minus my first row. So I'm going to replace my third row with my third row minus my first row.

Let's replaced the first row with the first row minus the third row.

So let me replace my first row with my first row minus my second row.

Why don't I add this row to 2 times that row.

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