anonymous
  • anonymous
|{ -x+y+2z=7 <|{ 2x-3y-2z=-4 |{ x -z=-2 possible answers are (3,3,5) (3,0,5) (-3,0,5) (3,0,-5)
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
the last one is the answer????
anonymous
  • anonymous
or the one before the last
anonymous
  • anonymous
ok lets see.

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anonymous
  • anonymous
last one doesn't work for lat equation. because 3-(-5) = 3+5 = 8
anonymous
  • anonymous
third one doesn't work for last equation because -3-5=-8
anonymous
  • anonymous
must be one of the first two. lets find it
anonymous
  • anonymous
-3+3+10=7 <|{ 6-9-10=-4 |{ 3 -5=-2
anonymous
  • anonymous
thats not it
anonymous
  • anonymous
nope it is not first one
anonymous
  • anonymous
-3+0+10=7 6-0-10=-4 3 5=-2
anonymous
  • anonymous
must be (3,0,5)
anonymous
  • anonymous
thats not it
anonymous
  • anonymous
yes, late equation is x - z = -2 so 3-5=-2 is correct
anonymous
  • anonymous
-3+0+10=7 6-0-10=-4 -3 5=-2
anonymous
  • anonymous
-3+7=10 6-10=-4 3-5=-2
anonymous
  • anonymous
the first one hast to be 7
anonymous
  • anonymous
last equation is x - z = -2 you wrote -x+z
anonymous
  • anonymous
no -5 cancelled out
anonymous
  • anonymous
yes it is if you use x=3,y=0,z=5
anonymous
  • anonymous
-3+0+2*5=-3+10=7
anonymous
  • anonymous
yes?
anonymous
  • anonymous
second equation is 2x-3y-2z = -4 we get 2*3-0-2*5=6-10=-4
anonymous
  • anonymous
and third is x-z=-2 we get 3-5=-2
anonymous
  • anonymous
so they all work for (3,0,5)
anonymous
  • anonymous
your right i am going to choose yours
anonymous
  • anonymous
good because it is true!

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