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March 25, 2017

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solve 2x+3y=13 with 4x+5y=23

  • maths - ,

    2x + 3y = 13

    4x + 5y = 23

    multiply the first equation by 4, the second by 2, add:

    8x + 12y = 52
    subtract these two equations
    8x + 10y = 46

    ______________

    2y = 6 Divide 2
    y=3

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