thcsbabygirl1224
  • thcsbabygirl1224
help me please 4x+y+5z=-9 x-4y-2x+-2 2x+3y-2z=21
Algebra
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Use matrix
thcsbabygirl1224
  • thcsbabygirl1224
what its a system of equations solving for 3 variables so im lost
thcsbabygirl1224
  • thcsbabygirl1224
@hartnn

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thcsbabygirl1224
  • thcsbabygirl1224
@LazyBoy @hba
thcsbabygirl1224
  • thcsbabygirl1224
@chainedecho
Loser66
  • Loser66
The second equation should be x-4y-2z =-2, right?
thcsbabygirl1224
  • thcsbabygirl1224
yes
Loser66
  • Loser66
take the third one subtract the second one, what do you get? that is (3) -(2) =??
thcsbabygirl1224
  • thcsbabygirl1224
i am trying to get rid of the x in all 3 equations so i have to set them to 0 im lost on the work
Loser66
  • Loser66
YOu lost on your way, give it a try on my way, ok? Again (equation 3 )-(equation 2) is??? You should work on it, I am guiding you only.
thcsbabygirl1224
  • thcsbabygirl1224
@kal1921 what is the matrics
Loser66
  • Loser66
Good luck.
thcsbabygirl1224
  • thcsbabygirl1224
ok i have now -2x-4y-2z=-4 2x+3y-2z=21
thcsbabygirl1224
  • thcsbabygirl1224
@Michele_Laino
Michele_Laino
  • Michele_Laino
here, you have a system of two equations, with three unknows. We can rewrite it as below: \[\left\{ \begin{gathered} 2x + 4y = 4 - 2z \hfill \\ 2x + 3y = 21 + 2z \hfill \\ \end{gathered} \right.\] which can, easily solved for x, and y as functions of z. Please try
thcsbabygirl1224
  • thcsbabygirl1224
You get 7y-4z=16

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