Question

2x - 3y - 4z = -21 -4x + 2y - 3z = -14 -3x - 4y + 2z = -10

Answer 1

SO, can you spilt it up into 3 eq for me? HINT: They will all =-10

Answer 2

2x - 3y - 4z = -21
-4x + 2y - 3z = -14
-3x - 4y + 2z = -10

Answer 3

what happened to your -21 in the second?

Answer 4

and your -14 in the 3rd?

Answer 5

or, is it already 3 eq not one bog long eq?

Answer 6

it was meant to be on the equation before

Answer 7

yes its 3 equations

Answer 8

ok so there are a few ways to solve a system of three equations

Answer 9

i tired eliminating and i just cant do it

Answer 10

tried*

Answer 11

1. you solve the others for a variable that is convenient then plug and chug.
2. you turn it into a matrix and put it into reduced row echelon form
3. you add or subtract eq.

So, if you know linear algebra2 is the easiest.
If you don't 3 is the easiest.

Answer 12

Try this for me, add 2 times equation 1 to eq. 2

Answer 13

what do you mean?

Answer 14

ie if I had 4x+2y=6 and -8x+3y=12 I would add 2 times eq 1 to two like so
2(4x+2y)=2(6)
8x+4y=12 so now,
+ -8x+3y=12
--------------------
0x+7y=24
so then you get
7y=24 and y=24/3

Do you see?

Answer 15

Also, this may help more: https://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/fancier-systems/v/systems-of-three-variables

Answer 16

its 3 variables though

Answer 17

Same idea

Answer 18

i will try it again then

Answer 19

You do the same thing

Answer 20

ok

Answer 21

Show every step please, even the teeny weeny ones

Answer 22

alright