Question

Sa se afle x,y,z

-2x+y+z=1
x-2y+z=1
x+y-2z=-2

Answer 1

Răspuns:

X=1

y=1

z=2

Explicație :

• x=1+2y-z
• x=-2-y+2z

=> 1+2y-z= -2-y+2z => y= -1+z=0 => y=1

• x=1+2-z => x=3-z

• x= -2-1+2z => -3+2z=x

-3+2z=3-z => 3z=6 => z=2

• x=1+2-2 => x=1