Question 1173881
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
https://www.symbolab.com/solver/matrix-gauss-jordan-calculator/gauss%20jordan%20
----------
Online Gauss-Jordan method calculator/all steps shown.
Simply choose 3x4 and enter the augmented matrix numbers.
A very good reference for an example of how-to. 
----------
Answer to Your System is P(1,-3,2)
Wish You the Best in your Studies.