Question

3x+y-z=3
x+2y+z=4
x+y+z=3

Answer 1

3х+у-z-x-y-z= 2x-2z=0
2x=2z
x=z
x+2y+z-x-y-z= y= 1
1+2x=3
2x=2
x=z=1
Ответ: х =1 у=1 z=1