Question

Alg2 help. (Elimination/substitution)

Answer 1

I dont know where to start..

Answer 2

Ik I have to pick a variablle to eliminate..twice

Answer 3

Then I have to multiply but Idk what.

Answer 4

Sorry I have to go for a while but I will be back in like 30 min... You can keep writing..I will read it later

Answer 5

x+y+z=-1 .....(1)
2x-y+2z=-5 .....(2)
-x+2y-z=4 .....(3)
adding (1) and (3)
3y=-1+4=3
y=3/3=1
put in (1) and (2)
x+1+z=-1, or x+z=-2
2x-1+2z=-5
2x+2z=-5+1=-4
x+z=-4/2=-2
from (3)
-x+2-z=4,
x+z=-2
let z=t ,then x=-2-t
solution is
x=-2-t
y=1
z=t
where t is a real number,giving different values to t ,we get infinite solutions.