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March 26, 2017

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what is 7x-9y=13 and 9x+7y=91
elimination method

  • algebra - ,

    let's eliminate the y's

    1st times 7 --> 49x -63y = 91
    2nd times 9 -> 81x + 63y = 819
    add them:

    130x = 910
    x = 7

    back into 2nd ...
    9(7) + 7y = 91
    7y = 28
    y = 4

    x=7 , y = 4

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