2. X + z = -1 + 3 = 2
3. 3z - 2y + x = 3 * 3 - 2 * 4 + - 1 = 9 - 8 + - 1 = 1 + - 1 = 0
4. 2z - y = 2*3 - 4 = 6 - 4 = 2
5. 2y + 6x = 2*4 + 6*-1 = 8 + -6 = 2
6. xyz + 10 = -1*4*3 + 10 = - 12 + 10 = - 2
7. 5x + 2y + z = 5*-1 + 2*4 = - 5 + 8 = 3
8. yz + 10x = 4*3 + 10*-1 = 12 + -10 = 2
9. y-z+x = 4 - 3 + - 1 = 1 + - 1 = 0
10. 2xz + y = 2*-1*3 + 4 = - 6 + 4 = - 2
11. (z - x) :2 = (3 - -1) :2= 4 :2 = 2
12. 12 - 5z - x= 12 - 5*3 - -1 = 12 - 15 + 1 = - 2
