Please help.
solve using elimination or substitution.
{-x-y-2z=9
-2x-2y-z=1
-x-y+z=-10}
all in same bracket.

Question

Please help. 
solve using elimination or substitution.
{-x-y-2z=9
-2x-2y-z=1
-x-y+z=-10}
all in same bracket.

anonymous · Answer

where are you stuck at, becuase there are a lot of steps in this?

anonymous · Answer

multiply 3rd equation by 2 add to 1...thats ur first eqn
add 2nd and 3rd eqn......that your 2nd eqn
do the same for those two equation

anonymous · Answer

so after I mult the 3rd equation by 2 I got -2x-2y+2=20 ?

anonymous · Answer

+2z**

anonymous · Answer

add it to first eqn then z will be cancelled

anonymous · Answer

then normally add 3rd eqn to 2nd eqn in that equation z will also cancel out

anonymous · Answer

in the same manner you have to cancel out x

anonymous · Answer

and you will get the value of y

anonymous · Answer

for the addition portion, it is

anonymous · Answer

i got that blank

anonymous · Answer

!!!!

anonymous · Answer

oh for the answer I got -3x+-|dw:1383116283989:dw|