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anonymous

  • one year ago

What values of x and y satisfy x − 3y = 4 and 2x + y = 7 simultaneously?

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  1. Loser66
    • one year ago
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    who will work? you or me?

  2. anonymous
    • one year ago
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    its Solving Linear Systems Using Linear Combinations

  3. anonymous
    • one year ago
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    idk how to work them out

  4. Loser66
    • one year ago
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    willing to work?

  5. anonymous
    • one year ago
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    willing to work?...i dont understand

  6. Loser66
    • one year ago
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    You don't know how to do, but if I guide and YOU are willing to work, we can work together to get the answer. If you don't want to work on it, OOOOOOOOOOOOOK, both us go to bed. hahahaha....

  7. anonymous
    • one year ago
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    well yea im willing to work on it

  8. Loser66
    • one year ago
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    ok, what is the fist equation?

  9. anonymous
    • one year ago
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    x − 3y = 4?

  10. Loser66
    • one year ago
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    yup, multiply both sides by 2, what do you get?

  11. anonymous
    • one year ago
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    2x-3y=8

  12. Loser66
    • one year ago
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    why -3y?

  13. anonymous
    • one year ago
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    idk its jus there

  14. Loser66
    • one year ago
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    hey, |dw:1433204298762:dw|

  15. anonymous
    • one year ago
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    ooooooo ok so u distribute

  16. Loser66
    • one year ago
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    yup, now what is the second equation?

  17. anonymous
    • one year ago
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    2x + y = 7

  18. Loser66
    • one year ago
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    ok, let them close to each other, and then subtract them, what do you have?|dw:1433204441490:dw|

  19. anonymous
    • one year ago
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    -5y=7?

  20. Loser66
    • one year ago
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    redo

  21. anonymous
    • one year ago
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    idk how u would get it

  22. Loser66
    • one year ago
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    You should be aware that I am ssssssssssso patient. I won't indulge you. You must work on it by yourself

  23. Loser66
    • one year ago
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    |dw:1433204716278:dw|

  24. Loser66
    • one year ago
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    =?

  25. anonymous
    • one year ago
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    -7y-1

  26. anonymous
    • one year ago
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    =1

  27. Loser66
    • one year ago
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    -7y =1 okkkkkk

  28. Loser66
    • one year ago
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    divide both sides by -7 , what do you get?

  29. anonymous
    • one year ago
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    y=-7 maybe?

  30. anonymous
    • one year ago
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    or positive 7

  31. Loser66
    • one year ago
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    |dw:1433204871798:dw|

  32. anonymous
    • one year ago
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    so when u divide 1 by a larger # it becomes a fraction?

  33. Loser66
    • one year ago
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    now, replace y = -1/7 into the second equation, what do you get?

  34. Loser66
    • one year ago
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    yup

  35. Loser66
    • one year ago
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    |dw:1433205038742:dw|

  36. anonymous
    • one year ago
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    |dw:1433205117411:dw|

  37. Loser66
    • one year ago
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    +1/7 both sides.

  38. anonymous
    • one year ago
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    -2x=-1?

  39. Loser66
    • one year ago
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    |dw:1433205229223:dw|

  40. Loser66
    • one year ago
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    |dw:1433205288926:dw|

  41. anonymous
    • one year ago
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    tbh im kinda confused on this step

  42. Loser66
    • one year ago
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    your ORIGINAL second equation is 2x +y = 7 replace y = -1/7 in, you have 2x-1/7 =7. Why confuse?

  43. anonymous
    • one year ago
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    ok i get tht part

  44. Loser66
    • one year ago
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    now, you have 2x = 50/7 divide both sides by 2, you get x. combine with y =-1/7 above, you have the solution. done

  45. anonymous
    • one year ago
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    ok i get it thx i appreciate it

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spraguer (Moderator)
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