Question

Solve the following system of equations for the unknown variables.
y = 2x

x = 2y – 2

Answer 1

sutitution x = 2y – 2

Answer 2

wait let me check

Answer 3

yeah last answer came up wrong would u like possible answer's?

Answer 4

y=2x
sutitution x=2y -2
y=2(2y-2)
y=4y-4
4y -y = 4
3y= 4
y = 4/3

Answer 5

now sutitution y =4/3 solve for x
x =2(4/3) -2
x=(8/3)-2
x=(8-(2*3))/3
x =(8-6)/3
x= 2/3

Answer 6

here is correct answer

Answer 7

yeah thats the one thank u how do you know when to substitute -2?

Answer 8

what u mean, the frist I solve is correct equation, but when I caculator I was wrong

Answer 9

-2 form this equation x = 2y – 2

Answer 10

im having issues with where ur getting the -2

Answer 11

r u getting now?

Answer 12

i understand the process of getting the answer but do i always use neg two or will it change with different
equations?

Answer 13

frist use ; y=2x

Answer 14

and sutitution x = 2y – 2

Answer 15

y=2( )
plug 2y – 2 inside Parentheses and solve

Answer 16

after find y =4/3
use eqution x = 2y – 2

x = 2( ) – 2
plug 4/3 inside Parentheses and solve

Answer 17

2 way can solve
* use subtitution
*elemate
this given value x and y you use sutitution more easy

Answer 18

know what u mean
2x-y=0
-x+2y=2 (this equation time 2) u get -2x+4y=4
-2x+4y=4
Add 2x-y=0
-----------------------
3y=4
y=4/3
this u mean? answer come up the same

Answer 19

ahh ok see i was confused which method to use substitution seems easier

Answer 20

if u have value x and y better do sutitution more easy
if standart from use elemate

Answer 21

cool ive got another one im haven issues with u wana check it out

Answer 22

ok

Answer 23

Solve the following system of equations for the unknown variables.
3x + 3y = 3

-3x – 2z = -11

y + z = -1

Answer 24

solving for x,y,z

Answer 25

u know how to get rid by negative side?

Answer 26

no

Answer 27

this standart from than solve by elemate

Answer 28

give me time this one is hard

Answer 29

yeah i figured out the last two but this one i keep running into problems

Answer 30

Sorry u need u sutitution not elemate
y + z = -1
y= -1-z
3x + 3y = 3 (plug y= -1-z in this eqution u get)
3x + 3(-1-z) = 3

Answer 31

can u solve next?

Answer 32

yeah i think so if z=-1 i just plug it into the other equations to get x and y

Answer 33

yes, I think u can do the rest

Answer 34

thanks how did u get so good at math

Answer 35

y + z = -1 (subtitution z= -1)
y+(-1) =-1
y -1 = -1
y =-1+1
y= 0

Answer 36

yeah i got x=1 y=0 z=-1

Answer 37

yes

Answer 38

makes sense i think i messed up when i put y=-z-1

Answer 39

let me check, some time I caculator wrong

Answer 40

z=1 not -1 check caculator

Answer 41

3x-3z=6
-3x – 2z = -11
--------------------------------
Add -5z=-5
z=1

Answer 42

thats gana change my other answers ill have to go back through

Answer 43

y + z = -1 (subtitution z= 1)
y+1 =-1
y = -1-1
y =-2

Answer 44

3x + 3y = 3
3x + 3(-2) = 3
3x-6=3
3x=3+6
x=9/3
x=3

Answer 45

i got same for x

Answer 46

good now plug and check

Answer 47

I plug
z=1
x=3
y=-2
the answer is correct

Answer 48

i got same those equations take forever!

Answer 49

I'm glad u can solve problem now ,some time u have to use sutittution

Answer 50

i can do the simple ones no problem but when they get complex i tend to get mixed up in my steps

Answer 51

this problem frist step u have to use sutitution

Answer 52

u know now?

Answer 53

yeah i was using the same method just got mixed up in the initial steps for finding z

Answer 54

I tutor my son he like solve by sbutitution instate elemate

Answer 55

cool im doing an electricians math course its been a very long time since ive done systems of equations

Answer 56

ok bye

Answer 57

thanks

Answer 58

np