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anonymous

  • one year ago

help me please

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  1. anonymous
    • one year ago
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    Solve the system by the addition method. x2 - 3y2 = 1 3x2 + 3y2 = 15 A. {( 1, 2), ( -1, 2), ( 1, -2), ( -1, -2)} B. {( 1, 2), ( -1, -2)} C. {( 2, 1), ( -2, 1), ( 2, -1), ( -2, -1)} D. {( 2, 1), ( -2, -1)}

  2. anonymous
    • one year ago
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    @isaac4321

  3. anonymous
    • one year ago
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    ._.

  4. JoannaBlackwelder
    • one year ago
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    Any thoughts on how to start?

  5. anonymous
    • one year ago
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    substitute the x and the y maybe

  6. JoannaBlackwelder
    • one year ago
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    Can you show me what you mean?

  7. anonymous
    • one year ago
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    1+2 - 3+2 -1= 1

  8. JoannaBlackwelder
    • one year ago
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    Hm, how did you get that?

  9. anonymous
    • one year ago
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    x2 - 3y2 = 1 substituted in this equation

  10. JoannaBlackwelder
    • one year ago
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    Hm, I'm not sure what you mean, but the question states to solve by the addition method. Not substitution.

  11. JoannaBlackwelder
    • one year ago
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    The addition method works by adding the equations together in a way that cancels out one of the variables.

  12. anonymous
    • one year ago
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    ok so how do i do that

  13. JoannaBlackwelder
    • one year ago
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    |dw:1439917233250:dw|

  14. JoannaBlackwelder
    • one year ago
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    See how I canceled out the y's?

  15. anonymous
    • one year ago
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    yes

  16. JoannaBlackwelder
    • one year ago
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    Sweet. Can you solve the equation for x?

  17. anonymous
    • one year ago
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    x=2

  18. anonymous
    • one year ago
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    or x=-2

  19. JoannaBlackwelder
    • one year ago
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    Exactly! Both are possible solutions for x! :-) Any ideas what to do from here?

  20. anonymous
    • one year ago
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    solve for y next maybe

  21. JoannaBlackwelder
    • one year ago
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    Yep, great! Any thoughts on how to do that?

  22. anonymous
    • one year ago
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    y=1 or y=-1

  23. JoannaBlackwelder
    • one year ago
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    Good, but which x goes with which y?

  24. anonymous
    • one year ago
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    i got that buy soing what you did in your drawing but i cancled out x then i solved what i got from that to get my answer

  25. JoannaBlackwelder
    • one year ago
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    Ok, that's cool. But if you plug them back in, which ones make true statements out of the equations?

  26. anonymous
    • one year ago
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    (y=1 x=2) (y=-1 x=-2)

  27. JoannaBlackwelder
    • one year ago
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    Are those the only options?

  28. anonymous
    • one year ago
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    idk are they

  29. JoannaBlackwelder
    • one year ago
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    Try other options and see if they work too.

  30. anonymous
    • one year ago
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    i cant get any of them to work

  31. anonymous
    • one year ago
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    so is my anser d right

  32. JoannaBlackwelder
    • one year ago
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    |dw:1439918238021:dw| What about this one?

  33. JoannaBlackwelder
    • one year ago
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    |dw:1439918310526:dw|

  34. anonymous
    • one year ago
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    so is the answer a

  35. JoannaBlackwelder
    • one year ago
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    No, that one has the x and y values flipped.

  36. anonymous
    • one year ago
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    ok imma stop guessing its c

  37. JoannaBlackwelder
    • one year ago
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    Sounds good

  38. anonymous
    • one year ago
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    thnx

  39. JoannaBlackwelder
    • one year ago
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    yw

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