Question 146084

Hi, you are literally trying to get the identity on the left hand side of the matrix.

You dont have to swap the rows but if you do then you will have:

1 3 = 9
-2 1=-4

then to get a zero in row 2 you can add 2 row1:

1 3=9
0 7=14

then we need a 1 where the 7 is and therefore we divide row 2 by 7:

1 3=9
0 1=2

Row 1 minus 3 row 2:

1 0=3
0 1=2

Therfore you read off your solution that x=3 and y=2 because column 1 relates to x and column 2 is y.