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March 25, 2017

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solve by the elmination method
0.3x-0.2y=4
0.4x+0.3y=49/23

  • math - ,

    1st one by 30 ----> 9x - 6y = 120
    2nd by 20 -------> 8x +6y = 980/23
    add them
    17x = 3740/23
    x = 220/23

    back into 8x + 6y = 980/23
    1760/23 + 6y = 980/23
    6y = -780/23
    y = -130/23

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