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Check my algebra

Did I solve this correctly? Thanks.
Solve for a.  s=15  f=12  t=6

f=s+at

f=s+at
f-s=s+at-s
f-s=at
(f-s)/t=a/t
(f-s)/t=a

(12-15)/6=a
-3/6=a
-1/3=a

The books answer is a=-0.5
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kadin
Asked:
kadin
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1 Solution
 
aleghartCommented:
f=s+at
f-s=s+at-s
f-s=at
(f-s)/t=a/t  << typo here:   (f-s)/t = at/t
(f-s)/t=a

Solve for a.  s=15  f=12  t=6

(12-15)/6=a
-3/6=a
-1/3=a    << 3/6 = 1/2, not 1/3.   1/3 = 2/6

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aleghartCommented:
^no problem with the algebra.  It's 2nd-grade fractions.  :)
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kadinAuthor Commented:
Thanks. You don't know how relieved I am that it is just a simple math error on my part.
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