Math

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Help Solving These?
There Are more like these ,
but i need examples to help me with the others.

1.5/2y+6 + 1/y-2=3/y+3

2. 3/3x-2 = 4/2x+1

3.5/3x - 1/9 = 1/x

4.2/x^2-x-12 -6/x+4 = 2/x-3

  • Math -

    You will need to use the distributive property of multiplication.



    5/(2y+6) + 1/(y-2) = 3/(y+3)
    5/2(y+3) + 1/(y-2) = 3/(y+3)
    2(5)/(y+3) + 2/(y-2) = 2(3)/(y+3)
    10/(y+3) + 2/(y-2) = 6/(y+3)
    2/(y-2) = -4/(y+3)
    (y-2)(2)/(y-2) = -4(y-2)/(y+3)
    2 = -4(y-2)/(y+3)
    2/(-4) = -4(y-2)/-4(y+3)
    -(1/2) = (y-2)/(y+3)
    -(1/2)(y+3) = (y+3)(y+2)/(y+3)
    -(1/2)(y+3) = (y+2)
    -(1/2)y - 3/2 = y + 2
    -(3/2) - 2 = y + (1/2)y
    -(3/2) - 4/2 = (2/2)y + (1/2)y
    -(7/2) = (3/2)y
    -(7/2) / (3/2) = y
    - (7/3) = y
    y = - 2 1/3

  • Math -

    hmmm. I don't get that.

    5/(2y+6) + 1/(y-2) = 3/(y+3)
    putting all over 2(y+3)(y-2), and discarding the denominator, we have

    5(y-2) + 2(y+3) = 3*2(y-2)
    5y - 10 + 2y + 6 = 6y - 12
    y = -8

    check:

    5/-10 + 1/-10 = 6/-10 = 3/-5
    ----------------------------
    3/(3x-2) = 4/(2x+1)
    putting all over (3x-2)(2x+1), we have
    3(2x+1) = 4(3x-2)
    6x + 3 = 12x - 8
    6x = 11
    x = 11/6
    -------------------------------
    5/3x - 1/9 = 1/x
    put all over 9x:
    5*3 - x = 9
    x = 6
    ------------------------------
    2/(x^2-x-12) -6/(x+4) = 2/(x-3)
    note that x^2-x-12 = (x-4)(x+3)
    So, putting all over (x-4)(x+4)(x-3)(x+3), we have
    2(x+4)(x-3) - 6(x+4)(x-3)(x+3) = 2(x-4)(x+4)(x+3)

    Now, that's kind of nasty. I think you have a typo. If instead we have

    2/(x^2+x-12) -6/(x+4) = 2/(x-3)
    the LCD = (x+4)(x-3), and we get

    2 - 6(x-3) = 2(x+4)
    2 - 6x + 18 = 2x + 8
    x = 3/2

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