Question

Rozwiąż układ równań
x+y-z= 0
2x-y+2z= 6
x-y+z= 2

Answer 1

X+y-z=0
2x-y+2z=6
x-y+z=2

z=x+y
2x-y+2z=6
x-y+z=2

2x-y+2(x+y)=6
x-y+x+y=2

2x-y+2x+2y=6
2x=2

4x+y=6
x=1

4+y=6

y=2

z=1+2=3