4分之y+1=3分之x+2,2x-3y=1

2个回答

  • (y+1)/4 = (x+2)/3 .(1)

    2x-3y = 1 .(2)

    由(2)得:

    y=(2x-1)/3.(3)

    将(3)代入(1)得:

    {2(x-1)/3+1)/4 = (x+2)/3

    3{2(x-1)/3+1) = 4(x+2)

    2(x-1) +3 = 4x+8

    2x-2+3 = 4x+8

    2x=-7

    x=-7/2

    将x=-7/2代回(3)得:

    y=(2x-1)/3 = (-7-1)/3 = -8/3

    所以,原方程组的解为{x=-7/2,y=-8/3

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