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    Chakea's Avatar
    Chakea Posts: 1, Reputation: 1
    New Member
     
    #1

    Dec 7, 2009, 06:40 PM
    3x+7y=-1 2x+3y=6
    How do you do elimenation method
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
     
    #2

    Dec 7, 2009, 08:13 PM

    Put them one ender each other like this:

    Code:
    3x + 7y = -1
    2x + 3y =  6
    Now, you have to eliminate one of the terms, either x or y.

    I'll show you how to eliminate x.

    If you multiply everything in the first equation by 2 and the second equation by three, you get 6x + 14y = -2 and 6x + 9y = 18 respectively.

    Now, put back one under the other:

    Code:
    6x + 14y = -2
    6x +  9y = 18
    See what I did? Now, x has the same coefficient (the number in front of x). Now, you can subtract the second equation from the first like an ordinary subtraction:

    Code:
    6x + 14y =  -2  -
    6x +  9y =  18
    0x +  5y = -20
    Then, you have only one variable, which you can find the value.

    Lastly, use that value of y in any of the two previous equations to find the value of x and you're done! :)

    I hope it helped! :)

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