what is
2x=5-7x=15
and
32=2n-3n+5n
Thanks
2006-11-19 15:05:53 · 15 answers · asked by One 2 in Science & Mathematics ➔ Mathematics
oh yeah my bad it's
2x+5-7x=15
2006-11-19 15:17:30 · update #1
32=2n-3n+5n
32=-1n+5n
32=4n
n=8
2x+5-7x=15
2x-7x=-5x
-5x+5=15
-5(-2)+5=15
10+15=15
x=-2
2006-11-19 15:11:38 · answer #1 · answered by Anonymous · 0⤊ 0⤋
I'll start with #2 first:
32=2n-3n+5n First, combine like terms:
32=2n - 8n
32= -6n Then let's divide both sides by -6:
-32/6 = n ...And then simplify...
-16/3 = n
-5 1/3 = n How's that?
Now let's take a look at #1...
2x = 5 - 7x = 15 This seems a bit confused... 2 = signs in one problem??
Perhaps we should separate it into two problems and see what it does...
2x = 5 - 7x
5 - 7x = 15
We'll take these one at a time:
9x = 5 I added 7x to both sides of the frist one...
x = 5/9 ...and now I divided by 9.
Now let's try the other one: 5 - 7x = 15
I subtract 5... - 7x = 10
...and then divide by -7: x = -10/7
= -1 3/7
Which does not agree with the other part... I recommend double-checking the original problem to see if we have a typo.
I hope this is of help to you!
Barjesse37
2006-11-19 23:40:53 · answer #2 · answered by barjesse37 3 · 0⤊ 1⤋
The first question is impossible. If you rewrite it to 5-7x=15 and 2x=15, then x=7.5 for the second breakdown. However, if you replace x in the first breakdown, you get 5-7*(7.5)=15, which is not true.
32=2n-3n+5n can be rewritten as 32=4n, and 32/4 = 8. Therefore, n=8.
2006-11-19 23:17:08 · answer #3 · answered by turcott2 2 · 0⤊ 0⤋
2x+5-7x=15 combine like terms
-5x+5=15 subtract 5 from each side
-5x=10 divide by -5
x=-2
32=2n-3n+5n combine like terms
32=4n divide by 4
8=n or n=8
2006-11-19 23:39:42 · answer #4 · answered by yupchagee 7 · 0⤊ 0⤋
2x=5-7x=15 ? Make sure you copy the question correctly!
32=2n-3n+5n
32=4n
n=8
2006-11-19 23:12:17 · answer #5 · answered by ElViN@CY 3 · 0⤊ 0⤋
you have a typo so I'll assume it should be 2x + 5 - 7x= 15 >>> x=-2. In the scond equation, n=8
2006-11-19 23:11:15 · answer #6 · answered by MrWiz 4 · 0⤊ 0⤋
First question no idea second 32=2n-3n+5n 32=-1n+5n 32=4n n=32/4 n=8
2006-11-20 05:24:07 · answer #7 · answered by sam 3 · 0⤊ 0⤋
They are like-terms.
The first one is impossible because there is no way to combine like-terms with 2 = signs
Second one,
32 = 4n
Then divide both sides by 4
32 / 4 which is 8 so n = 8
2006-11-19 23:16:37 · answer #8 · answered by poker5495 4 · 0⤊ 0⤋
32 = 10n
divide it by 10
n = 32/10
n = 16/5
2x=5-7x=15 makes no sense.
2006-11-19 23:08:25 · answer #9 · answered by Anonymous · 0⤊ 1⤋
x = -10/9
and
n = 8
2006-11-19 23:16:34 · answer #10 · answered by icantfindaname50 2 · 0⤊ 1⤋