Question 262622
X+2Y+Z=2  ----1
5X=Z  --------2
Y=-2X---------3

substitute the value of z in eq 1

x+2y+5x=2
6x+2y=2   ----a
y+2x=0 ---------3
multiply eq. 3 by 2
2y+4x=0 ---------b

solve equation a & b for x  subtract b from a

2x=2
x=1

apply for y and z