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krissywatts Group Title

solve system of equation: x+y=-1 y-z=4 2x+y+5z=-38

  • one year ago
  • one year ago

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  1. cyber405 Group Title
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    You can use y-4=z instead of z in the third equation... Do you know rest of the solution...?

    • one year ago
  2. helloihaveaquestion Group Title
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    plug it into your calculator!

    • one year ago
  3. krissywatts Group Title
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    i got 13,-14, and 10 or -10 and something still not adding up right

    • one year ago
  4. cyber405 Group Title
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    What's the problem...?

    • one year ago
  5. cyber405 Group Title
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    y - z = 4 ---> z = y - 4 x + y = -1 ---> x = -y-1 then plug these into third one... 2x + y + 5z = -38 ----> 2(-y-1) + y + 5(y-4) = -38 .... -2y-2+y+5y-20=-38 ----> 4y=16 y=... then plug y in other equations to find x and z...

    • one year ago
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