I'm extemely lost at some point, how do you solve this equation by using the inverse of the coefficient matrix and by echelon method

-x-8y=12
3x+24y=-36

-1 -8 +12 | 1 0

+3 24 -36 | 0 1

+1 +8 -12 |-1 0
+3 24 -36 |+0 1

+1 +8 -12 |-1 0
+1 +8 -12 |+0 1/3

HEY, as we should have seen immediately, the second equation is a multiple of the first. THERE IS NO SOLUTION!!! They are the same line on a graph, no intersection.
I think it was unfair to give you this problem at this point but anyway :(