Problem 2.5 a

[nbraynor]

Problem 2.5 a

[sangyun884]

I think so. A24 is 7 after subtraction

[malshoff]

No, his answer is correct. (-)2/1 = -2, so you multiply row 1 by -2 and add that to row 2. Same thing for row 3, and for row four, you'll multiply row 1 by (-5)/1 = -5, and add that to row 4. It's step 7 listed here: https://www.statlect.com/matrix-algebra/Gaussian-elimination