x+y=14
3x=4y
how do i solve for y?!
2007-03-22 17:29:43 · 9 answers · asked by joan. 3 in Education & Reference ➔ Homework Help
x + y = 14
which also means
x= 14 - y right?
well you plug in x
3x=4y
so
3(14-y) = 4y
then distribute
42 - 3y = 4y
add 3y to both sides
42 = 7y
then to find y
42/7
that equals 6 =]
2007-03-22 17:33:23 · answer #1 · answered by :) 2 · 0⤊ 0⤋
x=8 y=6
2007-03-22 17:33:23 · answer #2 · answered by jacobm_24 2 · 0⤊ 0⤋
y=6 x=8
2007-03-22 17:33:15 · answer #3 · answered by hi 2 · 0⤊ 0⤋
y=14-x
3x=4(14-x)
3x=56-4x
3x+4x=56
7x=56 divide both sides by seven so to get value of x
and then u get
x=8
then replace 8 for x in the first equation
8+y=14
to get y add -8 to both sides of the equation and u get
y=6
thus y=6 and x=6
2007-03-22 18:33:26 · answer #4 · answered by Anonymous · 0⤊ 0⤋
properly in all, he's studied 13/21, so B does not be your answer. Now you will possibly desire to subtract 13/21 from 21/21, on account that it fairly is the full type. So the respond could be A.) 8/21 :) i wish this facilitates! i'm like ninety% helpful it fairly is the ultimate answer, sorry whether that is not.
2016-10-19 09:47:23 · answer #5 · answered by ? 4 · 0⤊ 0⤋
Whoa, this is not pre-algebra!! Just solve both for y, then set them equal to each other. So,
y=14-x and
y=3x/4 put them equal to each other and solve for x
14-x=3x/4
4(14-x)=3x
56-4x=3x
56=3x+4x
56=7x
x=8
then put x=8 into one of the equations
8+y=14
y=14-8
y=6
hope this helps, if you need further explanation, e-mail me
2007-03-22 17:39:40 · answer #6 · answered by sippigrrrl 4 · 0⤊ 0⤋
x+y=14
x + y - x = 14 - x
y = 14 - x
3x=4y
3x/4 = 4y/4
3/4 x = y
2007-03-22 18:06:12 · answer #7 · answered by rooster1981 4 · 0⤊ 0⤋
x+y = 14
y=14-x
then,
3x= 4(14-x)
3x-3x= 56-4x+3x
-56 = -x
x=56
hope this clears things up. good luck
2007-03-22 17:41:32 · answer #8 · answered by Anonymous · 0⤊ 0⤋
x=14-y
3(14-y)=4y
42-3y=4y
42=7y
y=6
2007-03-22 17:32:07 · answer #9 · answered by Anonymous · 1⤊ 0⤋