3x + 4y = 12....solve for y....
2006-10-24 22:50:17 · 8 answers · asked by mixed 1 in Science & Mathematics ➔ Mathematics
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
2006-10-25 00:40:08 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
1
2006-10-25 07:26:02 · answer #2 · answered by Anonymous · 0⤊ 0⤋
y =3
2006-10-25 06:01:16 · answer #3 · answered by genius sonia 3 · 0⤊ 0⤋
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)
2006-10-25 05:53:52 · answer #4 · answered by sosta 3 · 0⤊ 0⤋
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
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y = 3 - 3/4x
**Three: Replace this equation with all with the value "y"
3x + 4(3 - 3/4x) = 12
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3x + 12 - 12/4x = 12
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(3x + 12 - 12/4x = 12)4
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12x + 48 - 12x = 48
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12x - 12x = 48 - 48
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0 = 0
**This equation has infinitely many solutions or you can say the formula to solve for Y is "y = 3 - 3/4x"
:) :) :) :) :)
2006-10-25 06:03:24 · answer #5 · answered by Princess Answers 3 · 0⤊ 0⤋
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.
2006-10-25 06:03:01 · answer #6 · answered by bks33691 2 · 0⤊ 0⤋
x=4, y=0
(3X4=12) + (4X0=0)
12+0=12
2006-10-25 05:59:45 · answer #7 · answered by need your e-mailADDRESS JOSHUA 1 · 0⤊ 0⤋
math ok first you bring a paper so it can help you plus or mines then add 2-2=0.
2006-10-25 05:53:02 · answer #8 · answered by Mido 1 · 0⤊ 0⤋