Question

Please help!
I need help with substitution method!
1. x+y=8
y=3x
2. 7x-2y=1
2y=x-1

I don't need to know how to solve it, I already know, I just have lots of work to do and my deadline is in like 2 hours! Thanks for your help and understanding :)

Answer 1

@UsukiDoll, you really seem to like Rarity from MLP! ;P

Answer 2

subsitute y = 3x in x+y =8

Answer 3

I know that, I just need the steps

Answer 4

then add x + 3x = 8
4x = 8
x = 2

Answer 5

subsitute 2 in the y= 3 x DATS 6

Answer 6

so ok ya x = 2 and y = 6 for the first 1

Answer 7

Thx! :)

Answer 8

7x-2y=1
2y=x-1
now umm letz seeeeee - x from both sides

Answer 9

make it all preettyyy yahhhh

Answer 10

LOL

Answer 11

Do u watch MLP???

Answer 12

7x-2y=1
2y-x = -1
Rearrangeee a bit yahhhh

-x+2y = -1
7x -2y = 1

oooo datz nice we can cancel the y;sss

Answer 13

yeah

Answer 14

6x = 0 datz ah 0
so y = 1/2
0-2y = 1
divide by -2
y = -1/2

Answer 15

So lemme guess, Rarity is ur fav Pony? ;P

Answer 16

-x+2y = -1
0 + 2(-1/2) = -1
-1 = -1
7x -2y = 1
0 - 2 (-1/2) = 1
1 = 1
so yahhh dey werk n twerk

Answer 17

umm yeah I got the plush and 3 in hasbro figure

Answer 18

Nice!

Answer 19

SO what's x and y?

Answer 20

y = -1/2 x = 0 for second probz

Answer 21

Thx so much! Do u know the elimination method?

Answer 22

ya... but subsitution ez bettah ... matrix method es mi favorita.

Answer 23

Ya but I'm supposed to solve this one using elimination method... 3x+3y=27 x-3y=-11

Answer 24

efff de instructions same result appears

Answer 25

And 2x+y=4 6x+7y=12 using substitution

Answer 26

ooo in dat case get rid of the y

Answer 27

3x+3y=27 x-3y=-11 y kan cancelz

Answer 28

then u get 4x = 16

Answer 29

Then???

Answer 30

x = 4 and then sub it back to one equation and get y

Answer 31

So y is....

Answer 32

I eating at da moment

Answer 33

Sorry if it seems like I'm pushing the answers out of ya it's just that I wanna finish this and get rid of it ASAP

Answer 34

Oh sorry then...

Answer 35

ah I got 3x+3y=27
diz es 12 + 3y = 27
subtraxt
u get 15
3y= 15
Y= 5

Answer 36

y = 5 x = 444444

Answer 37

I mean 4

Answer 38

Thx! :D

Answer 39

Sorry 4 da trubble

Answer 40

(Trouble)

Answer 41

2x+y=4 6x+7y=12 using substitution

ya u mutiply -3 for the first equation

Answer 42

so ummmmmmmmmmmm -6x-3y=-12
6x + 7y = 12
easy way to get de y
4y = 0 y = 0

Answer 43

sub bak in hea 6x + 7y = 12
6x = 12 x = 2
so x = 2 y = 0 and give me medal for this

Answer 44

So how do I give medal???

Answer 45

I'm new so ya

Answer 46

click on best response button

Answer 47

Did it

Answer 48

THX