anonymous
  • anonymous
complete the ordered triple 3x+3y+z=1 x-3y+2z=19 8x-2y+3z=34 someone please help
Mathematics
chestercat
  • chestercat
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amistre64
  • amistre64
whats this?
amistre64
  • amistre64
you should be a pro by now ;)
anonymous
  • anonymous
there u r, thought so cant figure out what i did wrong

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amistre64
  • amistre64
let me do this up in notepad and show you a better view of it....matrix style :)
anonymous
  • anonymous
please
anonymous
  • anonymous
r u still there doesnt usually take you this long
amistre64
  • amistre64
z =-1324/23 is one of them, if I did it right :)
amistre64
  • amistre64
does that sound right to you :)
anonymous
  • anonymous
i have no idea i didnt do the fractions
amistre64
  • amistre64
y = -5931/207
amistre64
  • amistre64
its messy, but lets see if it works in the end :)
anonymous
  • anonymous
i got x,y,z 2,-3,1
amistre64
  • amistre64
x = 3324/69
amistre64
  • amistre64
does it work what you got?
anonymous
  • anonymous
and of course mathlab says its wrong
anonymous
  • anonymous
dont know i hate fractions so i eliminate them
amistre64
  • amistre64
:) i dont think you can get around it this time
anonymous
  • anonymous
what happen to the superhero genious
anonymous
  • anonymous
can we start from the begining and work the problem
amistre64
  • amistre64
were gonna half to , i messed it up somewhere ;)
anonymous
  • anonymous
ok ready when u r
amistre64
  • amistre64
I got this so far :) and it looks about like what I had the last time...
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anonymous
  • anonymous
its confusing its not at all what i got i was doing it the way we were earlier
amistre64
  • amistre64
z = 4 :)
amistre64
  • amistre64
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anonymous
  • anonymous
-6x-6y-2z=-2 x-3y+2z=19 add them and u get -5x-9y=17
amistre64
  • amistre64
yeah, then it gets messy :)
amistre64
  • amistre64
y=-3, z=4
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amistre64
  • amistre64
x=2 :) lets double check it ;)
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amistre64
  • amistre64
it just formats better in notepad, and I dont get as lost :)
anonymous
  • anonymous
-9x-9y-3z=-3 8x-2y+3z=34 add them and you get -x-11y=31
anonymous
  • anonymous
-5x-9y=17 5x+55y=-155 add them together and get 46y=-138 y=-3
amistre64
  • amistre64
3(2)+3(-3)+(4)=1 6 -9 +4 = 1 10-9=1...true (2)-3(-3)+2(4)=19 2 +9 +8=19 10+9=19.......true 8(2)-2(-3)+3(4)=34 16 +6+12=34 16 +18=34 .......true (x,y,z) (2 ,-3, 4)
anonymous
  • anonymous
-x-11y=31 -x-11(-3)=31 -x-33=31 -x=-2 x=2
amistre64
  • amistre64
you got it :) I did the substitution method....I dont get as many errors that way
amistre64
  • amistre64
common "Z" ;)
amistre64
  • amistre64
that didnt work as well as it did in my head :)
amistre64
  • amistre64
you got 2 out of 3.... work the z.. work the z
anonymous
  • anonymous
3x+3y+2=1 3(2)+3(-3)+z=1 6x+-9y+z=1 -3+z=1 z=4
amistre64
  • amistre64
yay!!
anonymous
  • anonymous
my math was off thats how i got z=-1
amistre64
  • amistre64
lol..... my math was waaaayyyyyy off to begin with on this one :) BAD FINGERS!!!!
anonymous
  • anonymous
i forgot how to add i guess
amistre64
  • amistre64
hey, the cavemen lived without it... and we evolved ;)
anonymous
  • anonymous
yeah i think people made up this stuff and had to make it confussing so no one could tell them it was wrong
anonymous
  • anonymous
so when the variables change to a, b, c its the same just different letters
amistre64
  • amistre64
yep.
amistre64
  • amistre64
it dont matter what you name them, they are all just different variables in the end
anonymous
  • anonymous
ok so 6a+3b+c=-20 a-3b+2c=-12 17a-2b+3c=-88
amistre64
  • amistre64
work it out like you did the other one, and let see your moves lol
anonymous
  • anonymous
-12a-6b-2c=40 a-3b+2c=-12 add them together get -11a-9b=28
amistre64
  • amistre64
good so far...
anonymous
  • anonymous
-18a-9b-3c=60 17a-2b+3c=-88 add them get -a-11b=-28
amistre64
  • amistre64
-28?
amistre64
  • amistre64
yeah.......
amistre64
  • amistre64
-11a-9b=28 -a-11b=-28
anonymous
  • anonymous
-11a-9b=28 11a+121=308 add them get 112b=336 112(3)=336 b=3
amistre64
  • amistre64
b = 3, I agree
anonymous
  • anonymous
-a-11b=-28 -a-11(3)=-28 -a-33b=-28 -a=-61 a=61
anonymous
  • anonymous
is a right?
amistre64
  • amistre64
-a -33 = -28 -a = -28+33 -a = 5 a = -5
anonymous
  • anonymous
i got that the first time thought -61 was too high
anonymous
  • anonymous
6a+3b+c=-20 6(5)+3(3)+c=-20 30+9+c=-20 c=-59
amistre64
  • amistre64
c looks good :)
amistre64
  • amistre64
double check your answers by plugging these values in your eqautions and see if they work
anonymous
  • anonymous
mathlab says no
amistre64
  • amistre64
not mathlab, the original equations :)
anonymous
  • anonymous
i put my answers into mathlab it said they were wrong
amistre64
  • amistre64
do you have the correct equations? no typos?
anonymous
  • anonymous
a,b,c 5,3,-59
anonymous
  • anonymous
c has got to b wrong
amistre64
  • amistre64
6(5)+3(3)+(-59)=-20 30 +9 -59 = -20 39 - 59 = -20 -20 = -20 (5)-3(3)+2(-59)=-12 5 -9 -118 .....yeah :) 17a-2b+3c=-88
anonymous
  • anonymous
equation 1 is the only won that ckecked out right
amistre64
  • amistre64
-12a -6b -2c =40 a -3b +2c =-12 ------------------ -11a -9b = 28
anonymous
  • anonymous
thats what i got so where did i go wrong
amistre64
  • amistre64
(6a+3b+c=-20)-3 -18a -9b -3c = 60 17a -2b +3c =-88 ------------------ -a -11b =-28 ....good
amistre64
  • amistre64
(-a -11b =-28 )-11 11a +121b = 308 -11a - 9b = 28 ------------------ 112b = 336 b = 3
amistre64
  • amistre64
-11a - 9(3) = 28 -11a = 28+27 -11a = 55 a = -5
amistre64
  • amistre64
-5 -3(3) +c =-12 -5-9 +c = -12 -14 + c = -12 c = -12+14 c = 2
anonymous
  • anonymous
ok hold on thats way different then what i got
amistre64
  • amistre64
6a+3b+c =-20 a-3b+2c =-12 17(-5)-2(-3)+3(2) =-88 -85 +6 +6 that aint working either....
amistre64
  • amistre64
ow my brain hurts.....
anonymous
  • anonymous
dont quit on me now
amistre64
  • amistre64
do substitution......less error :)
amistre64
  • amistre64
doing it on paper :)
amistre64
  • amistre64
doing it on paper :)
anonymous
  • anonymous
a=-5
amistre64
  • amistre64
(a,b,c) (-5,3,1)
anonymous
  • anonymous
yeah thats what i just got
anonymous
  • anonymous
forgot to multiply by -1 to get a
amistre64
  • amistre64
and I had it, but missed that "2"c....which threw me lol
anonymous
  • anonymous
i still got 8 more and another page to do gonna b a long night for me
amistre64
  • amistre64
:) post another question on the left if you need to, this ones a bit long :)

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