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Math Help - Solving systems of equation

  1. #16
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    Re: Solving systems of equation

    How would you even start to solve this problem
    Last edited by asilvester635; November 20th 2012 at 03:50 AM.
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  2. #17
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    Re: Solving systems of equation

    How would you even start to solve this problem
    Last edited by asilvester635; November 20th 2012 at 03:50 AM.
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  3. #18
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    Re: Solving systems of equation

    How would you even start to solve this problem
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  4. #19
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    Re: Solving systems of equation

    Just the same way as before. Find t as before and then insert that into the first equation. Now it is quite easy.
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  5. #20
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    Re: Solving systems of equation

    Quote Originally Posted by asilvester635 View Post
    Well this was my original question ...
    For you and all other problem posters ... note the importance of posting the entire question from the start.
    Thanks from asilvester635, MarkFL and topsquark
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  6. #21
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    Re: Solving systems of equation

    How did you get 294, 164, 90, and 184?? I mean i get how the other guy got 201, 180 220, and 420.... ?????????
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  7. #22
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    Re: Solving systems of equation

    I collected like terms. If you are given x + y + 3 + 7 + 12 = 23, wouldn't you want to rewrite it as x + y = 1?
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  8. #23
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    Re: Solving systems of equation

    x+10+y+36+t+z+80=420
    -10 -36 -80
    x+y+t+z=294 (we already know that y+z=90)
    -y -z -90
    x+t=204 (We already know that t=94)
    -t -94
    x=110

    So now, since 210 people are enrolled in Computers, and we already know three out of the 4 computer slots in the venn diagram circle:
    210-110-36-10=z
    z=54 (that's your answer for how many students are taking all three courses)

    Finally, you can do one of 5 things to figure y out:
    1) solve for y in the equation with all of the variables equaling 420
    x+10+y+36+z+80=420
    x+y+t+z=294
    y=294-110-94-54

    2) Solve for y soley by using the rest of the fine arts numbers.
    Total Fine Arts Students: 180
    180-80-10-54=y

    3) Do the same thing as above, but for Economics:
    Total Eco Students: 220
    220-94-54-36=y

    4) Use the mini equation that we came up with z+y+t=184
    z equals 54, & t=94 so
    184-54-94=y

    5) Use the OTHER mini equation z+y=90
    z=54 so
    90-54=y

    So,
    1. 94/500
    2. 36/500
    3. 54/500
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