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could you help me with this math problem??? PLEASE?

3x + 4y = 12....solve for y....

8 Answers

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  • 1 decade ago
    Favorite Answer

    3x + 4y = 12

    3x + 4y -3x = 12 - 3x

    4y = 12 - 3x

    4y/4 = 12/4 - 3x/4

    y = 12/4 - 3x/4

    y = 3 - 3x/4

    - - - - - - -s

  • Anonymous
    1 decade ago

    1

  • 1 decade ago

    y =3

  • 1 decade ago

    3x + 4y = 12 therefore y=(12-3x) divided by 4

    u cannot actually solve y unless u hv an x value or another equation for the same question (simultaneous equations)

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  • 1 decade ago

    Simple in steps:

    **One: It's asking for "y" only so transpose (transfer) all that are NOT "y" to the other side.

    3x + 4y = 12

    ------------------

    4y = 12 - 3x

    **Two: Remove the 4 from "4y" so it can remane "y" only by dividing evrything by 4

    4y/4 = 12/4 - 3x/4

    ---------------------------

    y = 3 - 3/4x

    **Three: Replace this equation with all with the value "y"

    3x + 4(3 - 3/4x) = 12

    ----------------------------

    3x + 12 - 12/4x = 12

    ----------------------------

    (3x + 12 - 12/4x = 12)4

    ----------------------------

    12x + 48 - 12x = 48

    ----------------------------

    12x - 12x = 48 - 48

    ----------------------------

    0 = 0

    **This equation has infinitely many solutions or you can say the formula to solve for Y is "y = 3 - 3/4x"

    :) :) :) :) :)

    Source(s): I go to school...and I actually get to have an education where you know how to solve for equations...
  • 1 decade ago

    This is the equation for a straight line. If you solve for y, as above (y = -3x/4 + 3), you can plug numbers in for x and get (x.y) coordinates, which you could plot on a graph.

  • x=4, y=0

    (3X4=12) + (4X0=0)

    12+0=12

    Source(s): Joshua
  • 1 decade ago

    math ok first you bring a paper so it can help you plus or mines then add 2-2=0.

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