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dinorap1

  • one year ago

How do I solve this system using the elimination method? PLEASE HELP! 5x+4y=12 and 3x-3y=18

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  1. triciaal
    • one year ago
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    hint the second equation can be factored

  2. dinorap1
    • one year ago
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    What's happening here? 3x−3y=18 >x−y=6> 4x−4y=24

  3. dinorap1
    • one year ago
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    Oh, did you delete your response...?

  4. triciaal
    • one year ago
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    the objective of the elimination method is to pick a variable and make the coefficients equal and opposite so that will be eliminated when the equivalent equations are added

  5. SolomonZelman
    • one year ago
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    \(5x+4y=12\) \(3x-3y=18\) > \(x-y=6\) > \(4x-4y=24\) divided times by 6 6 \(5x+4y=12\) \(4x-4y=24\) ~~~~~~~~~ Add the two equations now, and tell me what you get.

  6. SolomonZelman
    • one year ago
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    I deleted my reply, to modify it....

  7. SolomonZelman
    • one year ago
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    MISTAKE: Oh, divide by 3, not 6.

  8. triciaal
    • one year ago
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    correction equation 2 divided by 3

  9. SolomonZelman
    • one year ago
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    yes, just said that

  10. triciaal
    • one year ago
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    mails crossed

  11. SolomonZelman
    • one year ago
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    :)

  12. dinorap1
    • one year ago
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    Oh, I see what you're doing now. Don't you mean multiplied by 4 for the 2nd step?

  13. SolomonZelman
    • one year ago
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    yes

  14. SolomonZelman
    • one year ago
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    Then you have to add the equations.

  15. dinorap1
    • one year ago
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    I was taught a different method to solve this though. Are you sure this is a valid way to solve for the elimination method?

  16. SolomonZelman
    • one year ago
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    yes, I am positive

  17. SolomonZelman
    • one year ago
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    (good that you noticed my typo errors, thank you)

  18. triciaal
    • one year ago
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    glad you are paying attention

  19. triciaal
    • one year ago
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    he choose to get rid of y's now add and solve for x

  20. triciaal
    • one year ago
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    yes that is the way and I was never in any of his classes

  21. dinorap1
    • one year ago
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    Alright I'll solve for it then! 9x=36 > (9/9)x=(36/9) > x=4

  22. SolomonZelman
    • one year ago
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    yes, x=4 is right.

  23. dinorap1
    • one year ago
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    And then you plug the value of x into one of the equations to get y. I can understand it from here! Thank you two so much for the help! :)

  24. SolomonZelman
    • one year ago
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    sure, yw

  25. triciaal
    • one year ago
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    no problem

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