Question

Eliminate or Addition
3x-y+z=-15
x+2y-z=1
2x+3y-2z=0

Answer 1

@waterineyes I can't Eliminate x or y.

Answer 2

I tried but I think I am wrong. I got equation 4 but I cant get equation 5

Answer 3

Don't go by Substitution..

Do you know Elimination Method??

Answer 4

yeah but this is kinda hard. I got 4x + y =-14 in my equation 4 but my equation % is 7y=1

Answer 5

equation 5

Answer 6

I am not getting what you are saying..

Tell me at very first what you did so I can know what car are you driving to solve this..
Ha haha..

Answer 7

3x-y+z=-15
+ x-2y-z=1
equal equation 4 which is 4x+y=-14

Answer 8

Oh sorry you are correct..

Answer 9

x-2y-z=1 multiplied by -2
-2x+2y+2z==0

Answer 10

Yes you will have equation 4 as : \(4x +y = -14\)

Answer 11

Is that +2y or -2y in the second equation??

Answer 12

I think you are right 4x-3y=-14

Answer 13

Firstly clear my point..

Check the second equation from the text and write it here again..

Answer 14

Is it 2y or -2y ???

Answer 15

3x-y+z=-15
+ x+2y-z=1
equal equation 4 which is 4x+y=-14

Answer 16

Yes now you are right..

Now multiply -2 to the second equation and tell me what you got..

Answer 17

x+2y-z=1(-2)
-2x-4y+2z=-2

Answer 18

Yes now add this with the third equation..

Answer 19

I think now you got it..

-y = -2

y = 2..

Find x and z then..

Answer 20

-2x-4y+2z=-2
+ 2x+3y-2z=0
equal to -y=-2

Answer 21

@waterineyes amI right?

Answer 22

do I need to devide it in -1 to get y=2? @waterineyes

Answer 23

Yes you are right..

-y = -2

multiply by -1,

y = 2..

Now find x and z..

Answer 24

x=-4 and z=-1?

Answer 25

Let me check wait..

Answer 26

Yes dear you are absolutely right...

Answer 27

Thanks a lot for your help dear

Answer 28

Welcome nia..