algebra
posted by Evelyn .
Aaron is 13 years older than shelby. in nine years, Aaron will be twice as old as shelby. how old is shelby?

a = s+13
(a+9) = 2(s+9)
a  s = 13
a  2s = 9
s = 4
a = 17
in 9 years:
s = 13
a = 26
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