Question

3x + 2y= 2
4x + y= -4

Answer 1

multiply second equation by 2

Answer 2

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

Answer 3

subtract second from first

Answer 4

-5x=10
x=-2

Answer 5

y=4

Answer 6

um you did that wrong

Answer 7

let me show you the correct way
its called elimination method

Answer 8

oh where's my mistake? i'm not perfect sorry.

Answer 9

3x + 2y= 2
(4x + y= -4)-2

Answer 10

3x + 2y= 2
4x + y= -4
---------

y = -4x - 4
3x + 2(-4x - 4) = 2
3x -8x - 8 = 2
-5x = 10
x = -2

3(-2) + 2y = 2
-6 + 2y = 2
2y = 8
y = 4

(-2,4)

Answer 11

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

Answer 12

-5x=10
x=-2

Answer 13

substitution >>> elimination

Answer 14

you want the y's to cancel

Answer 15

so its times -2 not 2

Answer 16

are you not seeing how we got the same answer. Chris?

Answer 17

the difference is I subtracted the equations. I didn't add them.

Answer 18

slet me show you substitution then

Answer 19

You can do either. You might want to properly educate yourself on the topic before you start calling people out.

Answer 20

3x + 2y= 2
4x + y= -4

Answer 21

wait5 a sec

Answer 22

ill show you

Answer 23

i already did the substitution method juss sayin'

Answer 24

for substitution i would solve one equation for y

Answer 25

hah heated.

Answer 26

before you finish. my answer was x = -2 and y = 4 as shown above. So you are going to tell me that is incorrect?

Answer 27

4x + y= -4
y=-4x-4

Answer 28

substitute that for y in the other equation

Answer 29

4 = -4x-4
8 = -4x
x=-2

Answer 30

Chris. just stop.

Answer 31

3x + 2(-4x-4)= 2
3x-8x-8=2
-5x=10
x=-2

Answer 32

Lol

Answer 33

thank you for again proving my point

Answer 34

thats substitution

Answer 35

there was nothing wrong with the elimination method I did. get over it.

Answer 36

you multiplies by 2 instead of -2

Answer 37

it was completely wrong

Answer 38

+2y and +2y do not eliminate

Answer 39

that would give him 4y

Answer 40

I am not saying you were trying to do it wrong, you just made a mistake

Answer 41

ChrisV you can always expand your horizons. Yes you can multiply by -2 then add, But you can just as easily and correctly multiply by +2 and then subtract. The fact that you can eliminate by both adding or subtracting is something you should put in your "solving" tool box.

Answer 42

3x+2y=2
8x+2y=-8
11x+4y=-6

that in know way is right

Answer 43

you can not multiply by 2 and get the right answer there

Answer 44

if you can my friend you have invented a new form of the elimination method

Answer 45

please add it to my precal book so i can inform the aurhors

Answer 46

you have to multiply bu -2 not 2

Answer 47

3x+2y=2
-8x-2y=8
-5x=10
x=-2

Answer 48

You are missing the point: 3x+2y=2
-(8x+2y=-8)
------------
-5x = 10
x=-2

Answer 49

why not call it the subtraction method then? The point is to multiply by a value that eliminates a variable

Answer 50

Just tryinying to sho the simplest way i guess, but yes that comes out correct too

Answer 51

show

Answer 52

anyways lets do something else lol, nothing more to argue about here. Just gonna disagree anyways

Answer 53

Yes that is true, and you may eliminate it either by subtracting or adding depending on your choice of the sign of your multiplier. I am not saying you are wrong and if you wish to restrict your mode of operation to always adding, then have at it.

Answer 54

not adding its called multiplication

Answer 55

lol Chris, maybe when you further your actual understanding of what it means to execute the elimination method then talk to me. Go ask any knowledgeable math teacher or professor you have ever had. I don't appreciate being told that I'm wrong when clearly, I am not. I'm not at all saying what you did was wrong but the fact that you have the inability to realize that the elimination method has multiple execution techniques and then accusing EVERYONE else of being wrong is just disrespectful. I'm sure you are a smart guy but you need to expand your horizon. I have been doing a lot of math for a very long time now. Good luck in the future.