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

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

### 8 Answers

- SAMUEL DLv 71 decade agoFavorite 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

- Anonymous1 decade ago
1

- 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.