Use crammers rule to solve the system of linear equations

Question

3x+2y-z = 0
2x-y+z = 1
x-y+2y= -1

Answer 1

Cramer's rule is well explained here:
http://www.purplemath.com/modules/cramers.htm

You will need to calculate the determinants of four 3x3 matrices. I assume you know how to do that. If not, it's high time to learn how.