Question

2x-y+2=2.
3x+y-2z=9.
-x+2y+5z=5

Procedimiento

Answer 1

*2x-y+2=2
x=y/2
*3x+y-2z=9
-x+2y+5z=5

15x+5y-10z=45
-2x+4y+10z=10

13x+9y=55
x=55-9y/13

*y/2=55-9y/13
13y=110-18y
31y =110
y=110/31
*x=110/62
x=55/31