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x-y+2z=5 ecuacion 2
x-y-3z= -10 ecuacion 3
restamos ecuacion 1 y 2........obtenemos ecuacion 4
x+y+z=6
x-y+2z=5
2x+3z=11 ecuacion 4
restamos ecuacion 1 y 3....... obtenemos ecuacion 5
x+y+z=6
x-y-3z= -10
2x-2z= -4 ecuacion 5
restamos ecuacion 4 y 5
2x+3z=11...................2x+3z=11
-1(2x-2z= -4)..............-2x+2z=4
5z=15........z=15/5...........z=3
si z=3
2x-2z= -4
2x-2(3)= -4
2x-6= -4
2x= -4+6
2x=2
x=2/2
x=1
si x=1 z=3
x+y+z=6
1+y+3=6
y+1+3=6
y+4=6
y=6-4
y=2
solucion:
x=1 y=2 z=3