SOLUTION: I am having difficulty with augmented matrices. I need and would appreciate any help with this problem: Using the augmented matrices to solve the following 2X2 systems of equations

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Question 141192: I am having difficulty with augmented matrices. I need and would appreciate any help with this problem: Using the augmented matrices to solve the following 2X2 systems of equations. Final answer must be given in matrix form.
Problem to solve: -5x + 7y =9
x + 10y = 21
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Using the augmented matrices to solve the following 2X2 systems of equations. Final answer must be given in matrix form.
Problem to solve: -5x + 7y =9
x + 10y = 21
-----------------------
1...10...21
-5...7....9
------------------
Multiply 1st row by 5 and add to 2nd row to get:
-------
1...10...21
0...57..114
------------
Divide thru 2nd by 57 to get
1...10...21
0....1....2
---------------
Multiply 2nd row by 10 and subtract from 1st row to get:
1....0....1
0....1....2
===============
Solution:
x = 1 ; y = 2
====================
Cheers
Stan H.