Question

ayuden son ecuaciones
x + y + z = 6
x - y + 2z = 5
x - y - 3z = -10

Answer 1

x+y+z=6
x-y+2z=5
x-y-3z=-10

x+y+z+x-y+2z+x-y-3z=6+5-10
3x-y=1
3x-1=y

(x+y+z)-(x-y+2z)=6-5
x+y+z-x+y-2z=1
2y-z=1
2y-1=z

x+y+z+x-y-3z=6-10
2x-2z=-4
2x-2(2y-1)=-4
2x-4y+2=-6
x-2y=-3
x-2(3x-1)=-3
x-6x-2=-3
-5x=5
x=1
y=2
z=3