how do you do this??
(i cant type fractions....)
solve for n
5n+1 over 8 = 1 over 2
2007-12-17 17:05:01 · 7 answers · asked by haybish2012 3 in Science & Mathematics ➔ Mathematics
If a/b = c/d, then ad = bc (cross multiplication).
So...
(5n+1)(2) = 8(1)
10n + 2 = 8
10n = 6
n = 6/10 = 3/5 = 0.6
2007-12-17 17:08:39 · answer #1 · answered by kinuman 2 · 1⤊ 0⤋
5n + 1 / 8 = 1 / 2
(cross multiply to get)
2(5n + 1) = 8
5n + 1 = 8 / 2
5n + 1 = 4
5n = 3
n = 3/5
2007-12-17 17:09:35 · answer #2 · answered by xxx_ax_bx_cx 2 · 1⤊ 0⤋
(5n+1)/8 = 1/2
(5n+1)/8 = 4/8 ....... [multiply 1/2 by 4/4]
5n + 1 = 4 ........... [multiply by 8 to get rid of the denominator]
5n = 3
n = 3/5
Now recheck:
(5(3/5) + 1)/8 = 1/2
(15/5 + 1)/8 = 1/2
(3 + 1)/8 = 1/2
4/8 = 1/2
1/2 = 1/2
2007-12-17 17:17:28 · answer #3 · answered by jonthecomposer 4 · 0⤊ 0⤋
(5n+1)/8 = 1/2
8(5n+1/8) = 8(1/2)
5n + 1 = 4
5n = 3
n = 3/5
2007-12-17 17:55:46 · answer #4 · answered by An ESL Learner 7 · 0⤊ 0⤋
5n+1/8 +1/2
8=2(5n+1) (see below)
8=10n+2
8-2=10n
6=10n
6/10=n
3/5=n
you start by cross multiplying (5n+1)*2 and 8*1
2007-12-17 17:11:05 · answer #5 · answered by major pain 2 · 1⤊ 0⤋
People answering your question are having
trouble because of the way you stated the problem.
It is not clear what is over 8.
It could be 5n + 1
or it could be 8.
2007-12-17 17:32:34 · answer #6 · answered by I ain't nothing but a hound dog. 5 · 0⤊ 0⤋
multiply both sides by 8 to get 5n+1=4 and then subtract 1 from both sides to get 5n=3
dived 5 by both sides and you get n=5/3
2007-12-17 17:08:21 · answer #7 · answered by sandysdachshund 3 · 1⤊ 2⤋