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    artem1's Avatar
    artem1 Posts: 2, Reputation: 1
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    #1

    Feb 26, 2012, 04:01 PM
    i need help with this solution
    x+2y=9
    2x-y=8
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 27, 2012, 11:15 AM
    Note that the y term in the first equation is positive and negatve in the second, but they differ by a factor of 2. So if you multiply the second equation by 2 you can then add it to the first equation anf cancel out the y's, like this:

    x + 2y = 9
    + 2(2x-y) = 2(8)
    -----------------
    x + 2y + 4x -2y = 9 + 16,

    Regroup:
    5x = 25

    Can you take it from here?
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