algebra
posted by rhey
The second term of an arithmetic sequence is 24 and the fifth term is 3.Find the first term and the common difference.

Reiny
Use your formulas.
a+d = 24
a+4d = 3
subtract them:
3c = 21
d = 7
in a+d=24
a=7=24
a = 31
first term is 31, common difference is 7
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