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

- anonymous

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

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- anonymous

multiply second equation by 2

- anonymous

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

- anonymous

subtract second from first

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## More answers

- anonymous

-5x=10
x=-2

- anonymous

y=4

- anonymous

um you did that wrong

- anonymous

let me show you the correct way
its called elimination method

- anonymous

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

- anonymous

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

- anonymous

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)

- anonymous

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

- anonymous

-5x=10
x=-2

- anonymous

substitution >>> elimination

- anonymous

you want the y's to cancel

- anonymous

so its times -2 not 2

- anonymous

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

- anonymous

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

- anonymous

slet me show you substitution then

- anonymous

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

- anonymous

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

- anonymous

wait5 a sec

- anonymous

ill show you

- anonymous

i already did the substitution method juss sayin'

- anonymous

for substitution i would solve one equation for y

- anonymous

hah heated.

- anonymous

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

- anonymous

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

- anonymous

substitute that for y in the other equation

- anonymous

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

- anonymous

Chris. just stop.

- anonymous

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

- anonymous

Lol

- anonymous

thank you for again proving my point

- anonymous

thats substitution

- anonymous

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

- anonymous

you multiplies by 2 instead of -2

- anonymous

it was completely wrong

- anonymous

+2y and +2y do not eliminate

- anonymous

that would give him 4y

- anonymous

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

- radar

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.

- anonymous

3x+2y=2
8x+2y=-8
11x+4y=-6
that in know way is right

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

you have to multiply bu -2 not 2

- anonymous

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

- radar

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

- anonymous

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

- anonymous

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

- anonymous

show

- anonymous

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

- radar

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.

- anonymous

not adding its called multiplication

- anonymous

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.

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