Really Hard Math Problem D:

puppyloverlauren • 27 November 2012 at 9:48 PM

@twilight_raptor

How did you get this:
-3x -8 -2x = -7

to this?

x = 8-7


@ems

lol kay X3

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

trish • 27 November 2012 at 9:49 PM

@puppyloverlauren Okay, um. Nevermind. o_e Never listen to me again. XD

puppyloverlauren • 27 November 2012 at 9:50 PM

@trish No, it's okai X3 you tried X3

@jennifer
@menagerie
@hedwig68
@hay7199

hedwig68 • 27 November 2012 at 9:51 PM

@puppyloverlauren

What's the math problem? 😋

puppyloverlauren • 27 November 2012 at 9:52 PM

@hedwig68

-x+y=4
-3x-2y=-7

duchess • 27 November 2012 at 9:52 PM

@puppyloverlauren

For this problem?

-x+y=4 -----(1)

-3x-2y=-7 ----- (2)

twilight_raptor • 27 November 2012 at 9:53 PM

@puppyloverlauren

-3x -8 -2x = -7

first take the Xs to one side and number to the other:

-3x -8 +8 -2x = -7 +8
-3x -2x = 1
-5x =1
x= -(1/5)

O.o made a mistake earlier gimme a moment...

ems • 27 November 2012 at 9:53 PM

@puppyloverlauren xDD

Ermm... lemme think..

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

and

if x = 2y+6.... then... um...

I DON'T KNOW! D'X

LOL... It could be ANYTHING.

And I haven't done this yet... D8

So... I give up. "X3

Um...

@cat might know.

cat • 27 November 2012 at 9:54 PM

@ems I'm in sixth grade xD

puppyloverlauren • 27 November 2012 at 9:55 PM

@ems

Lol kay X3

@duchess

the answer is (1,5) DX

@twilight_raptor

X3

jennifer • 27 November 2012 at 9:55 PM

@puppyloverlauren OMG! Whoever pinged me totally messed up my post! I was posting the answer and then I noticed a Gobbler and then clicked it and then pressed Ctrl and then went to check how much I had and then the ping showed up and then I pressed Ctrl to see what's up but then I pressed W by accident.
I'll start again (it helps with mistakes, sorry, I go to gifted school so we were taught like that). BTW What grade stuff is this?

twilight_raptor • 27 November 2012 at 9:55 PM

@puppyloverlauren editted first post but i didnt get 1 ,5 o.o
you sure the equations are correct...?

puppyloverlauren • 27 November 2012 at 9:55 PM

@jennifer

Algebra ._.

skylark • 27 November 2012 at 9:56 PM

@puppyloverlauren

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

y=-3(2y+60+4
y=-6y-18+4
y=-6y-14
(add +6y to both sides)
7y=-14

y=-2


x=2(-2)+6
x=2

puppyloverlauren • 27 November 2012 at 9:59 PM

@skylark

OMG THANK YOU SO MUCH!!!! 😃 😃 😃

duchess • 27 November 2012 at 10:00 PM

@puppyloverlauren The answers may be wrong xD

I'm pretty sure I haven't made any errors xP

puppyloverlauren • 27 November 2012 at 10:01 PM

@duchess

There are some typos but some of the answers are right DX

jennifer • 27 November 2012 at 10:02 PM

@puppyloverlauren I made grade grade. Like 4th, 8th... 1st. XD

ems • 27 November 2012 at 10:03 PM

@puppyloverlauren XD @skylark's smart. .__.

skylark • 27 November 2012 at 10:04 PM

@puppyloverlauren
No worries! My brain was a bit rusty, but I remember a lot. Any other questions?
I can't do --v
-x+y=4
-3x-2y=-7
That one's impossible, unless it's written wrong. 😋

@ems Thanks! 😃

puppyloverlauren • 27 November 2012 at 10:05 PM

@ems kay X3

@jennifer
What?

@skylark
@skylark
@skylark

PLEASE HELP! SOS T-T

duchess • 27 November 2012 at 10:05 PM

@puppyloverlauren Aw, xD Maybe you should check with your teacher just to be sure 😊

skylark • 27 November 2012 at 10:06 PM

@puppyloverlauren
What's up? 😃

puppyloverlauren • 27 November 2012 at 10:08 PM

@skylark

I need help with these questions T-T

1)2x+2y=2
-4x+4y=12
answer: (1/2, 1/2)

2)1/2x+1/3y=6
x-y=2
answer: (8,6)


@duchess
lol kay X3

twilight_raptor • 27 November 2012 at 10:18 PM

your first set of equation is such that x and y cannot be equal (therefore both cant be 1/2). reason is one of the equation is :
-4x +4y =12
simplify that:
4(-x +y) =12
-x +y = 12/4
y -x = 3
(now you see that if both x and y have equal values they would cancel out and result in zero not three)

Got one for you

1) 1/2x+1/3y=6
x/2 + y/3 = 6
> 3x +2y = 36
2) x-y=2

2) x= 2 +y

substitute:

3(2 +y) +2y = 36
6 +3y +2y = 36
5y = 30
y= 6

substitute:

x= 2 +y
x= 8

skylark • 27 November 2012 at 10:19 PM

@puppyloverlauren
2x+2y=2
-4x+4y=12
Lol, my shortcut failed(-1,2)... this is why I am not a math geek xD
One more time.
I got (-1,2)?
Lemme try again.
GAH. I got (-1,2) again. >.<
Can't do that one, sorry.
CAUSE IT'S FALSE.

1/2x+1/3y=6
x-y=2
EDIT:
Answered. XD

puppyloverlauren • 27 November 2012 at 10:21 PM

@twilight_raptor

NEVERMIND I GOT IT! THANK YOUZ!


@skylark

wha??? X3 kay

twilight_raptor • 27 November 2012 at 10:25 PM

1/2x+1/3y=6

that is the same as:
x/2 +y/3 =6

simplify that by finding common denominator which is 6 here (2x3):

(3x/6) + (2y/6)= 6
(Notice 3x/6 is the same as x/2 (3/6= 1/2)when you simplify it and same goes with y)

simplify further by cancelling out the denominator 6 by multiplying x and y by 6:
( (3x/6) x6 ) + ( (2y/6) x6 )= 6 x6
3x + 2y =36

puppyloverlauren • 27 November 2012 at 10:32 PM

@twilight_raptor

I got it THANK YOU SO MUCH!!



Okay this is the LAST QUESTION

@skylark
@twilight_raptor

y=1.2x-4
2.2x+5=y

twilight_raptor • 27 November 2012 at 10:36 PM

1) y=1.2x-4
2) 2.2x+5=y

substituting equation 1 into 2:

2)
2.2x +5 =y
2.2x +5 = 1.2x -4

(Bringing Xs to one side and number to the other):

2.2x -1.2x = -4 -5

1x= -9
x= -9

Solve for y:
1)
y=1.2x-4
y= 1.2(-9) -4
y= -14.8

Is that the answer @puppyloverlauren @skylark