Answer:
see below
Step-by-step explanation:
We are looking for the coefficient matrix
The coefficients of the first equation are 2 -1
And the second equation are 1 1
We write them in the same order x y
2 -1
1 1
I have never seen an official name for the other 2
0 -1
-3 1
has the solutions substituted in for the x coefficients
It is used to help determine the x value
2 0
1 -3
has the solutions substituted in for the y coefficients
It is used to help determine the y value
Without choices, this is the best I can give you
