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    mclovin92's Avatar
    mclovin92 Posts: 5, Reputation: 1
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    #1

    Mar 6, 2010, 03:36 PM
    how to solve sysem of equations
    I need help with this system of 4 x 4 system of equations:

    2a-6b+4c-6d=-12
    4a+6b-c+2d=25
    2a+8c-6d=-12
    2a+6b-3c+d=17
    FadedMaster's Avatar
    FadedMaster Posts: 1,510, Reputation: 148
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    #2

    Mar 6, 2010, 03:42 PM

    Is there any methods you have already tried? If you've already attempted the problem, you will probably benefit better from any help by posting any attempts you have made.

    Also, is there a specific method that you are to be using? There's a few ways to solve for those variables.
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    mclovin92 Posts: 5, Reputation: 1
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    #3

    Mar 6, 2010, 03:44 PM

    I have made a few attempts and am absolutely stumped . I just somewhere to start from
    FadedMaster's Avatar
    FadedMaster Posts: 1,510, Reputation: 148
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    #4

    Mar 6, 2010, 03:48 PM
    Quote Originally Posted by mclovin92 View Post
    i have made a few attempts and am absolutely stumped . i just somewhere to start from
    What method of solving systems of equations are you practicing right now?

    If you're using substitution, then that problem gets pretty messy. If you're supposed to use addition (adding each equation to one another), then it's a little more manageable.

    This page may help with either of those: Algebra II: Systems of Equations and Inequalities - Math for Morons Like Us

    The middle section deals with using addition. That is the method I would use to solve that one, unless your teacher wants you practicing substitution.

    EDIT: Oh yeah, I forgot about Gaussian elimination too (http://www.purplemath.com/modules/systlin6.htm).
    mclovin92's Avatar
    mclovin92 Posts: 5, Reputation: 1
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    #5

    Mar 6, 2010, 03:55 PM

    I am allowed to use either method
    mclovin92's Avatar
    mclovin92 Posts: 5, Reputation: 1
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    #6

    Mar 6, 2010, 06:00 PM
    Quote Originally Posted by FadedMaster View Post
    What method of solving systems of equations are you practicing right now?

    If you're using substitution, then that problem gets pretty messy. If you're supposed to use addition (adding each equation to one another), then it's a little more manageable.

    This page may help with either of those: Algebra II: Systems of Equations and Inequalities - Math for Morons Like Us

    The middle section deals with using addition. That is the method I would use to solve that one, unless your teacher wants you practicing substitution.

    EDIT: Oh yeah, I forgot about Gaussian elimination too (Systems of Linear Equations: Gaussian Elimination).
    I used that link but it doesn't talk about using problems w 4 equations and variables
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #7

    Mar 6, 2010, 06:36 PM

    You can also use determinents.
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