Wow. I need help. Spring Break got me all messed up. How do I find x in:
x/0.4=2x+1.2
2007-03-19 12:13:15 · 6 answers · asked by Smuckers 4 in Education & Reference ➔ Homework Help
x/0.4=2x+1.2
multiply by 0.4
x = 0.4(2x + 1.2)
x = .8x + 0.48
combine like terms
0.2x = 0.48
divide
x = 2.4
2007-03-19 12:18:01 · answer #1 · answered by crzywriter 5 · 2⤊ 0⤋
You had spring break already? Lucky... I still have to wait 2 more weeks.
You need to isolate the side with the X to find it on its own, so subtract 2x from each side. You get:
-x/0.4=1.2
Multiply each side by 0.4 to finish isolating the X.
I'm not multiplying 0.4 by 1.2 for you because that would be too much and a little bit of cheating. Then, put the final answer in negative(because the X is still negative).
I'm in geometry, maybe im getting a little rusty at Algebra...
2007-03-19 19:22:46 · answer #2 · answered by megabraingeek 4 · 0⤊ 0⤋
i prefer to work with fractions.
.4 = 2/5
.2 = 1/5
x/2/5 = 2x + 1 1/5
5/2 x = 2x + 1 1/5
5/2 x - 2x = 1 1/5
1/2 x = 1 1/5
x = 2 2/5 = 2.4
2007-03-19 19:36:28 · answer #3 · answered by Anonymous · 0⤊ 0⤋
multiply by 2.5 = 1/0.4
x = 5x + 3
4x = -2
x = - 1/2
opps .. misread
2007-03-19 19:21:29 · answer #4 · answered by hustolemyname 6 · 0⤊ 0⤋
x/0.4=2x+1.2
x/0.4 - 2x = 1.2
x(1/.4 - 2) = 1.2
1/.4 = 2.5
x(2.5 - 2) = 1.2
x(.5) = 1.2
x=2.4
2007-03-19 19:18:08 · answer #5 · answered by ericl 3 · 1⤊ 0⤋
x/0.4 = 2x+ 1.2 put both x's on one side
*x *x
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0.4 = 3x +1.2 - 1.2 from each side
-1.2 -1.2
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-0.8 = 3x divide 3 from both sides
/3 /3
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-2.6 = x
2007-03-19 19:34:42 · answer #6 · answered by ♥me, myself and i♥ 3 · 0⤊ 0⤋