Confusion with how to make an augmented matrix

[John004]

Homework Statement

So in the attachment you'll see a picture taken from a linear algebra book where a linear system of equations is presented in the equivalent augmented matrix form. I'm confused about the representation of the first equation in the augmented matrix. What happened to the constant 4? Shouldn't the first row in the matrix be [ 0 -1 -1 1 | -4 ]?

Homework Equations

The Attempt at a Solution

 

[Stephen Tashi]

Shouldn't the first row in the matrix be [ 0 -1 -1 1 | -4 ]?

Yes, it should be. The "4" in the first equation is probably a misprint.

 

[John004]

Yes, it should be. The "4" in the first equation is probably a misprint.

Ah ok, good. I thought I was going crazy for a second there.