Question

Find the values of X.Y.Z
2x+y+z=5
x-y+2z=4
x+y+z=4

Answer 1

@lgbasallote

Answer 2

@Hero help

Answer 3

add equation 2 and equation 3

Answer 4

how?

Answer 5

x - y + 2z = 4
x + y + z = 4

what's x + x?

Answer 6

x^2?

Answer 7

nope that is x times x

Answer 8

2x?

Answer 9

better

Answer 10

now what's -y + y

Answer 11

0

Answer 12

good..what's 2z + z?

Answer 13

3z

Answer 14

and 4+4?

Answer 15

8

Answer 16

therefore

x -y + 2z = 4
x + y + z = 4
------------
2x + 3z = 8 <---let this be equation 4 (we set it aside for now)

Answer 17

now add equation 1 and 2

Answer 18

okay i did that and i got 3x+3x=9 do i combine that with equation 4?
@igbasllote

Answer 19

dont you mean 3x + 3z = 9?

Answer 20

coz im reading 3x + 3x = 9..my eyes could be blurred though

Answer 21

yes

Answer 22

well then very good you combine it with equation 4

3x + 3z = 9
2x + 3x = 8

the question is...do you add or subtract?

Answer 23

add?? :/

Answer 24

let's try...

3x + 3z = 9
2x + 3x = 8
-----------
5x + 6z = 17 <---you still have two variables

remember the point of this thing is to lessen the number of variables...

Answer 25

so since adding didnt work you subtract

Answer 26

ahh okay

Answer 27

so subtract

3x + 3x = 9
2x + 3x = 8

what do you get as difference?

Answer 28

1x or X and 0z and 1

Answer 29

(@lgbasallote lol you have been typing 2x + 3x =8, think it's supposed to 2x + 3z = 8)

Answer 30

@nphuongsun93 right! lol

Answer 31

lol im making the same mistake =)))))

Answer 32

anyway @sharee2012 you're right x = 1

Answer 33

ahh sleep calls lol

Answer 34

thank you :D very much for the help

Answer 35

now substitute x = 1 into equation 4 or 5 whichever you prefer to get z...then substitute x and z into equation 1,2 or 3

Answer 36

thank you for being a participative learner <tips hat>

Answer 37

im a little confused

Answer 38

confused where?

Answer 39

the pluggin in to solve the last part -_-

Answer 40

have you found out what z is yet?

Answer 41

is z 0?

Answer 42

@igbasallote?

Answer 43

Not an i, it's an L. :)
Z is not zero.

3x+3z = 9
You've already found x = 1, so substitute the value of x:
3(1)+3z=9

Answer 44

lol sorry i was not able to come...you tagged the wrong account it's LGBASALLOTE. IGBASALLOTE is a different user lol

Answer 45

anyway thanks for coming on my behalf @Wired

Answer 46

oh okay sorry im so tired lol and okay i get it @Wired yes thank u very much :D

Answer 47

No problemo