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anonymous

  • one year ago

I will fan and medal! 5x+7y=31 2x+4y=16 Which of the following systems could be used to solve the given system of equations by the addition method? 10x + 14y = 31 and -10x - 20y = 16 10x + 14y = 62 and 10x + 20y = 32 -10x - 14y = -62 and 10x + 20y = 80

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  1. anonymous
    • one year ago
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    im not quite sure what your asking, do you mean which of the bottom system of equations give you the same value as the top system of equations?

  2. anonymous
    • one year ago
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    yes i think so @Jdosio

  3. anonymous
    • one year ago
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    When you solve a system of equations with the addition method, you want the sign you are getting rid of to be opposite on top and bottom. So for example, 5x and -5x. So we can get rid of one of the choices immediately.

  4. anonymous
    • one year ago
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    okay, we can get rid of the 2nd one @LegendarySadist

  5. anonymous
    • one year ago
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    Yep. Now look at the other two. See which one of them has a mistake in how it was solved.

  6. anonymous
    • one year ago
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    Im not sure how to figure that out @LegendarySadist

  7. anonymous
    • one year ago
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    I'm having a hard time trying to figure out how to explain it as well /:

  8. anonymous
    • one year ago
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    oh well thank you for your help anyways! @LegendarySadist

  9. anonymous
    • one year ago
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    Sorry I couldn't be of more help. As a hint, look at the first choice's numbers after the = sign.

  10. radar
    • one year ago
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    A bigger hint: Look closely at the last one.

  11. radar
    • one year ago
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    What do you get when you add them?

  12. radar
    • one year ago
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    |dw:1438202427268:dw|

  13. radar
    • one year ago
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    |dw:1438202552579:dw|

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spraguer (Moderator)
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