Question 1078725
Entering the 3 x 3 equations into a matrix (A)
then enter the constants into a 3 x 1 matrix (B)
Enter A and press x^-1 to invert it. Then enter B.  Multiply them
A^(-1)B will give a 3 x 1 matrix which is the answer.
-2
3
1
for x , y, z 
(-2, 3, -1)