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anonymous

  • 4 years ago

elimination method 7r-6s=36 6r+7s=43 ordered pair solution (-13,6) is this right??

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  1. Hero
    • 4 years ago
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    7r-6s=36 6r+7s=43 r = (36 + 6s)/7 r = (43-7s)/6 r = r 6(36 + 6s) = 7(43 - 7s) 216 + 36s = 301 - 49s 301 - 216 = 85s 85 = 85s 85/85 = s 1 = s

  2. Hero
    • 4 years ago
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    r = 6

  3. anonymous
    • 4 years ago
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    (7r-6s=36)-6 (6r-7s=43)7 -42r+36s=-216 42r-49s=301 13s=85

  4. anonymous
    • 4 years ago
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    s=85/13

  5. Hero
    • 4 years ago
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    Chris, (r,s) = (6,1) is the solution

  6. anonymous
    • 4 years ago
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    -85/13 oops

  7. anonymous
    • 4 years ago
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    ok how is what you did elimination method?

  8. Hero
    • 4 years ago
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    If you want me to prove it to you, I will

  9. Hero
    • 4 years ago
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    Because I eliminated r variable, then solved for s

  10. Hero
    • 4 years ago
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    It's just not elimination method you're used to. Besides, my methods get the correct answer. I can't really speak for the elimination methods you're used to.

  11. anonymous
    • 4 years ago
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    please do i have never seen your way

  12. Hero
    • 4 years ago
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    I invented my way, that's why. If you use x and y as variables you'll see why.

  13. anonymous
    • 4 years ago
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    always inte

  14. Hero
    • 4 years ago
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    I invented a plethora of approaches to math that make much more sense than methods taught in school. Some of which are pretty silly and potentially confusing.

  15. Hero
    • 4 years ago
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    You can prove it to yourself by plugging in r = 6 and s = 1 back into the original equations

  16. anonymous
    • 4 years ago
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    Chris Chris Chris..

  17. anonymous
    • 4 years ago
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    lol i asked him to teach me? what?

  18. anonymous
    • 4 years ago
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    i am sure i made a mistake somewhere but i was interested in his method

  19. Hero
    • 4 years ago
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    The method I use, you've been taught it already.

  20. Hero
    • 4 years ago
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    y = mx+b If you have an equation with x and y on the same side, and you want to isolate y, say, for graphing reasons, you can do that. In this case, I isolated r, which would be y. I do this so that it's easier to solve systems of equations, also I can graph the equations I isolated on a graph to check them. So I'm doing two thing by using my method. I'm providing a way to check my answer graphically, and I'm finding an easier, simplier way to solve the more difficult systems of equation problems.

  21. anonymous
    • 4 years ago
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    oh i already looked at what you did but to me its a lot like the susbstitution methos instead of the elimination method asked in the question

  22. Hero
    • 4 years ago
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    7y-6x=36 6y+7x=43 y = (36 + 6x)/7 <---I graph this to check y = (43-7x)/6 <---and this too y = y 6(36 + 6x) = 7(43 - 7x) 216 + 36x = 301 - 49x 301 - 216 = 85x 85 = 85x 85/85 = x 1 = x 6 = y

  23. anonymous
    • 4 years ago
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    you must realize that some instructors would want to see that problem done by instruction instead of substituting for r

  24. anonymous
    • 4 years ago
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    but im not arguing, just making an observation

  25. Hero
    • 4 years ago
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    I would argue that I did eliminate one variable while solving.

  26. anonymous
    • 4 years ago
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    what you did was solve each equation for r then set them equal

  27. Hero
    • 4 years ago
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    Either way, no one has yet to post the solution you're looking for.

  28. Hero
    • 4 years ago
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    I figure that maybe you would but instead you want to argue with me.

  29. anonymous
    • 4 years ago
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    well im justsaying what you did is almost the exact definition of the substitution method

  30. Hero
    • 4 years ago
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    Chris, everyone is waiting for you to post the "correct" solution.

  31. anonymous
    • 4 years ago
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    well ok ill show you

  32. Hero
    • 4 years ago
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    I posted my solution because I don't care much for the elimination method as you know it.

  33. anonymous
    • 4 years ago
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    but im not arguing

  34. Hero
    • 4 years ago
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    Whatever you say man :P

  35. anonymous
    • 4 years ago
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    i unsderstand that, and if the question didnt ask for a specific method i would agree with you

  36. anonymous
    • 4 years ago
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    im not trying to argue with you at all

  37. anonymous
    • 4 years ago
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    (7r-6s=36)-6 (6r-7s=43)7 -42r+36s=-216 42r+49s=301 85s=85 s=1

  38. Hero
    • 4 years ago
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    I posted a solution since no one had posted one yet. And by technicality, I did indeed eliminate r variable by substitution.

  39. anonymous
    • 4 years ago
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    that would be elimination method

  40. anonymous
    • 4 years ago
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    same answer just different method

  41. Hero
    • 4 years ago
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    Well, it's about time...only took about a whole hour for someone to do it.

  42. anonymous
    • 4 years ago
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    if they had asked them to do it susbstitution method, you answer is absolutely correct

  43. anonymous
    • 4 years ago
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    there is just two different methods

  44. Hero
    • 4 years ago
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    If it has to take an hour to post the solution, I'd rather stick with my methods...

  45. anonymous
    • 4 years ago
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    well just realize there are two methods and when it asks you do do it that way for college per say, then the other method would be wrong

  46. anonymous
    • 4 years ago
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    even though the answer is the same

  47. Hero
    • 4 years ago
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    I'm just happy the correct solution is finally posted. I just posted my solution for fun.

  48. anonymous
    • 4 years ago
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    heh no problem man, just do not want you to think I am arguing

  49. Hero
    • 4 years ago
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    I know, you're just trying to get your point across while I'm trying to get mine across. No one in their right minds would consider that arguing :P

  50. anonymous
    • 4 years ago
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    lol i call it debating

  51. anonymous
    • 4 years ago
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    one of us will come up with the right answer eventually

  52. Hero
    • 4 years ago
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    debating = formal argument

  53. anonymous
    • 4 years ago
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    it sounds nicer though

  54. Hero
    • 4 years ago
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    This must have been how it was like when Leibnitz and Newton was arguing over who invented Calculus

  55. anonymous
    • 4 years ago
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    lol

  56. Hero
    • 4 years ago
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    Good night Chris...

  57. anonymous
    • 4 years ago
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    night

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