Question

x+y+z=2 what is z?

Answer 1

Any other information besides that?

Answer 2

yesh.. hold on please.

Answer 3

Okkie dokes.

Answer 4

3x-2y+2z=-8
and
8z-12y-x=12

Answer 5

Post the full question... I assume it's:

x+y+z=2
3x-2y+2z=-8
8z-12y-x=12

First write the equations in order x, y, z (the last one mainly):

x + y + z = 2
3x - 2y + 2z = -8
-x - 12y + 8z = 12

Note you can start by using elimination - the first and third equatons when added together, the x's will cancel.

Answer 6

yesh ok uh... does it matter what i multiply it by to elimenate?

Answer 7

is it 4?

Answer 8

well is z 4?

Answer 9

"z" is the \(26^{th}\) letter in the alphabet.

Answer 10

ok.?

Answer 11

@agent0smith ?

Answer 12

K brit i got ya

Answer 13

uh ok? ???????????

Answer 14

Elimination method for three variables,!!.!?

Answer 15

x + y + z = 2
3x - 2y + 2z = -8
-x - 12y + 8z = 12

add the first equation and third equation together (no need to multiply by anything, just add them together):
x + y + z = 2
3x - 2y + 2z = -8
-11y + 9z = 14 (our new third equation)

Now you can try eliminating x in the second equation... you could multiply the first by -3, then add that result to the second equation.

Answer 16

Agentsmith we need your help

Answer 17

?

Answer 18

x + y + z = 2
3x - 2y + 2z = -8
-11y + 9z = 14

multiply the first by -3:

-3x -3y -3z = -6
3x - 2y + 2z = -8
-11y + 9z = 14

Now add the first and second equation together

-3x -3y -3z = -6
- 5y - z = -8
-11y + 9z = 14

Now all we need is to find z. So just solve the second and third equations:

- 5y - z = -8
-11y + 9z = 14

Answer 19

well we can combine the questions again and have -16y + 8x = 6

Answer 20

Bail

Answer 21

sorry 8z

Answer 22

yes, no?

Answer 23

"well we can combine the questions again and have -16y + 8x = 6"

will that help you find z..?

You need to use either elimination or substitution to solve these two:

- 5y - z = -8
-11y + 9z = 14

Answer 24

I meant 8z and yes it will.

Answer 25

How will -16y + 8z = 6 help you find z unless you know y?

Answer 26

oh.. then we need to use the substitution for y.?

Answer 27

Yeah, or use elimination. It might be easiest to find y first, then find z.

You could multiply the first equation by 9, then add the equations together, that'll get rid of z so you can find y.
- 5y - z = -8
-11y + 9z = 14

Answer 28

ok then is is -16y=6

I think... right....? but you cant divide 16 and 6.... D:

Answer 29

First multiply the first eqn by 9:
9(- 5y - z = -8) gives:
-11y + 9z = 14


-45y - 9z = -72
-11y + 9z = 14

Now add those two together.

Answer 30

-56y=-58

Answer 31

Delete what...?

Answer 32

nvm srry im getting tired... its almost midnight here.

Answer 33

Wait, i found a mistake:

It should be:

- 5y - z = -14
-11y + 9z = 14

Now multiply by 9

9(- 5y - z = -14)
-11y + 9z = 14

to get

-45y - 9z = -126
-11y + 9z = 14

Answer 34

ok so then it is -56y=-112?
and that is equal to 2.

Answer 35

y=2

Answer 36

Yay! Now find z. Use either of these equations:
- 5y - z = -14
-11y + 9z = 14

Answer 37

Don't use that one, i think that was from the error earlier. Use these (either one):

- 5y - z = -14
-11y + 9z = 14

Answer 38

then it is -22+9z=14
22+14=36
36/9=4

Answer 39

z=4

Answer 40

thankyou thankyou thankyou!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 41

gotta go now but, thankyou thankyou thankyou!!!!!!!!!!

Answer 42

Haha you're welcome :)