anonymous
  • anonymous
Solve the System of equations 3x + 3y + 2z = –5 x + y + 3z = –4 2x + 2y + 5z = –7
Mathematics
katieb
  • katieb
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goformit100
  • goformit100
|dw:1343833778651:dw|
mathslover
  • mathslover
ok so first of all : 3x+3y+2z=-5 3x + 3y = -5-2z 3(x+y)=-5-2z x+y = (-5-2z) ------- 3 x = (-5-2z)/3 - y
mathslover
  • mathslover
put this value in the above equations

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anonymous
  • anonymous
@mathslover my bro you're the best
anonymous
  • anonymous
whats the graph? The dud who drew the pic? Whats that
mathslover
  • mathslover
it is fully dependent on you "which method you want to chose" thanks @annas , there may be mistake as no one is perfect in any field
anonymous
  • anonymous
@mathslover i have no idea what that was haha
anonymous
  • anonymous
i think substitution would work best
anonymous
  • anonymous
you can also use matrix method
anonymous
  • anonymous
? whats that?
mathslover
  • mathslover
@NashNugs seems that you are working on substitution at present so go through that IF you have studied matrices then use the @goformit100 's method
anonymous
  • anonymous
|3 3 2| -5| |1 1 3| -4| |2 2 5| -7| make the row echelon form and you'll get your answers
anonymous
  • anonymous
i have not studies the matrix method. But i found the answer with substitution.
anonymous
  • anonymous
ok it was just for your knowledge :)
mathslover
  • mathslover
good then
anonymous
  • anonymous
would the answer be -4,3,-1?
anonymous
  • anonymous
thats what i got, i might have done something wrong tho
anonymous
  • anonymous
is that what you got?
anonymous
  • anonymous
mathslover
  • mathslover
yes it seems right to me

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