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Loujoelou

  • 3 years ago

If you were to use the elimination method to solve the following system, choose the new system of equations that would result after the variable y is eliminated in the first and second equations, then the second and third equations. 3x – y + 3z = 1 4x + y – 6z = 3 4x – 2y + 3z = –3 7x – 3z = 4 12x – 9z = 3 7x – 3z = 4 4x – 6z = 3 3x + 3z = 1 12x – 9z = 3 3x + 3z = 1 4x – 6z = 3

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  1. ParthKohli
    • 3 years ago
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    I prefer a question at a time. I'd help you with the first.

  2. ParthKohli
    • 3 years ago
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    Add all equations.

  3. Loujoelou
    • 3 years ago
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    Lol it is a question, 9ut the last 8 sets are choices.

  4. Loujoelou
    • 3 years ago
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    4 sets*

  5. ParthKohli
    • 3 years ago
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    lol

  6. waterineyes
    • 3 years ago
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    Ha ha ha..

  7. ParthKohli
    • 3 years ago
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    Start by adding the top two equations.

  8. waterineyes
    • 3 years ago
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    What do you get?? @Loujoelou

  9. Loujoelou
    • 3 years ago
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    I know it's either C/D, cause 3x+3z=1 is what you get when you eliminate y from 1st/2nd equation.

  10. Loujoelou
    • 3 years ago
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    nvm other way around. It's A/B

  11. Loujoelou
    • 3 years ago
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    Cause you get 7x-3z=4 not what I said earlier.

  12. ParthKohli
    • 3 years ago
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    Yep.

  13. ParthKohli
    • 3 years ago
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    Now, you multiply the second equation by 2 and then add equation 1 and 2.

  14. waterineyes
    • 3 years ago
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    Now multiply second equation by 2 and then add second and third equation and let us see what you get.

  15. Loujoelou
    • 3 years ago
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    K I get it now :) It's A cause you get 12x-9z=3. Was just a little confused about it.

  16. ParthKohli
    • 3 years ago
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    Yep! :)

  17. Loujoelou
    • 3 years ago
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    tyvm @waterineyes @ParthKohli I understand it perfectly now :) At least doing this by elimination method I mean.

  18. ParthKohli
    • 3 years ago
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    You got the thing successfully. Congratulations, Lou!

  19. waterineyes
    • 3 years ago
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    You are doing this by elimination only @Loujoelou

  20. Loujoelou
    • 3 years ago
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    Lol thx @ParthKohli and yes for this problem I had to @waterineyes

  21. waterineyes
    • 3 years ago
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    Okay..

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