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

    Nov 18, 2010, 09:13 AM
    solve using elimination method 9x - 7y =120.5 , -36x 28y = -482
    9x - 7y = 120.5
    -36x + 28y = -482

    (2) -2x - 8y = 22
    -6x - y = 20
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 19, 2010, 05:42 AM

    9x - 7y = 120.5
    -36x + 28y = -482

    The second equation can be simplified. Divide it by 4:

    -9x + 7y = -120.5

    Well... since both equations are the same, they meet from negative infinity to positive infinity.

    -2x - 8y = 22
    -6x - y = 20

    Simplify the first equation by dividing it by 2:
    -x - 4y = 11

    Multiply the second equation by 4:
    -24x - 4y = 80

    Now, subtract one equation from the other. Can you do this?

    Code:
       -  x - 4y = 11
-  -24x - 4y = 80
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