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    lax32's Avatar
    lax32 Posts: 1, Reputation: 1
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    #1

    Oct 14, 2007, 09:20 AM
    algebra 2
    how do you solve this using elimination?

    x+2y=1
    4x+y=11
    sGt HarDKorE's Avatar
    sGt HarDKorE Posts: 656, Reputation: 98
    Senior Member
    		  
    #2

    Oct 14, 2007, 09:33 AM
    you need to either get x or y equal to cancel out but one has to be a negative.

    x+2y=1 --> -4(x+2y=1) --> -4x-8y=-4
    4x+y=11 ------> + 4x+y=11
    -----------
    0-7y=7 ---> y=-1

    Now plug that for X: (Use any equation)

    4x+(-1)=11 --> 4x-1=11
    +1 +1
    4x=12 --> x=3

    The answer is: (3,-1)
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