anonymous
  • anonymous
Can someone please help me. I need help "solving the system" 2x+y+z=9 -x-y+z=1 3x-y+z=9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
Start off by adding line one and line two; and now you have at least the y disappearing.
anonymous
  • anonymous
I did that. I did it with 1st and 3rd to get 5x+2z=9
anonymous
  • anonymous
Then I went and did it to the 1st and 2nd. Giving me x+2z=10

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anonymous
  • anonymous
OK, you have infinitely many choices and your classmates may go about a different way. in x+2z=10 Let z=0. It is your equation you can do what ever you want. So when z=0 in your eq x=10. So x=10, z=0, punch those values in the third eq and solve for y
anonymous
  • anonymous
?? Thanks. sorry, but you lost me.
anonymous
  • anonymous
Its not what our teacher said to do, and I know I will be required to show my work.
anonymous
  • anonymous
The proof is you can plug in the values of x,y,z and see if it equals what is on the other side. Math has a lot of different methods. Tell me specifically what you don't understand.
anonymous
  • anonymous
I came up with (2,1,4) and it fits into the equation. Am I right?
anonymous
  • anonymous
Let's test it with the second equation -x-y+z=1 -2-1+4=1 1=1 You are exactly right
anonymous
  • anonymous
:)) Yay!!!!!! Thanks!
anonymous
  • anonymous
You can also test them with the others to make sure it wasn't a fluke, but you are doing great.
anonymous
  • anonymous
Now, if I can get the next one...lol!
anonymous
  • anonymous
UGH... This one isnt working out right... Can I explain (the best I know how) what I am doing????
anonymous
  • anonymous
Sorry I had signed out to watch basketball. Hope you figured it out.

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