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anonymous

  • one year ago

help How can x2 = x2 + 2x + 9 be set up as a system of equations? A) y = x2 − 9 y = x2 + 2x + 9 B) y = x2 y = x2 + 2x + 9 C) y = x2 + 2x y = x2 + 9 D) y = x2 y = 2x + 9

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  1. anonymous
    • one year ago
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    @zepdrix

  2. anonymous
    • one year ago
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    x2 means x^2

  3. zzr0ck3r
    • one year ago
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    Any ideas?

  4. anonymous
    • one year ago
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    no not at all

  5. anonymous
    • one year ago
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    I was thinking option B but I'm not sure

  6. zzr0ck3r
    • one year ago
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    The way you can check, is by setting each equation in the system equal to each other and see if you get the above equation Example: The first one y = x2 − 9 y = x2 + 2x + 9 Set them equal x^2-9=x^2+2x+9 This is not what we started with, so it is not the answer.

  7. zzr0ck3r
    • one year ago
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    You are right, but now do you understand why?

  8. anonymous
    • one year ago
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    yes I do :)

  9. anonymous
    • one year ago
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    so letter B is the correct answer

  10. zzr0ck3r
    • one year ago
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    yep

  11. zzr0ck3r
    • one year ago
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    if you set them equal, you get the thing you started with.

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spraguer (Moderator)
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