- #1

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**Given augmented matrix [A|0]: -->RREF -->x=?**

I started with:

|0 1 0|0|

|0-3 1|0|

|0 0 2|0|

--->RREF--->

|0 1 0|0|

|0 0 1|0|

|0 0 0|0|

The RREF is correct according to solution manual, but

the solution manual says that the vector x =

|1|

|0|

|0|

I think I understand why x_3 and x_2 =0, But I don't understand why x_1 =1.