Question

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

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

+2z**

Answer 5

add it to first eqn then z will be cancelled

Answer 6

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

Answer 7

in the same manner you have to cancel out x

Answer 8

and you will get the value of y

Answer 9

for the addition portion, it is

Answer 10

i got that blank

Answer 11

!!!!

Answer 12

oh for the answer I got -3x+-