SOLUTION: Find the first term and the common difference of the arithmetic sequence whose 5th term is 7 and 13th term is 39. Can you please help?

Question 853876: Find the first term and the common difference of the arithmetic sequence whose 5th term is 7 and 13th term is 39. Can you please help?
Found 2 solutions by richwmiller, Vladdroid:
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
an = a + (n - 1)d
39 = a + 12d
7 = a + 4d
32=8d
d=4
a=-9

Answer by Vladdroid(91) (Show Source): You can put this solution on YOUR website!
an = a + (n - 1)d
----------------------
39 = a + 12d
----------------------
7 = a + 4d
---------------------
32=8d
----------------------
d=4
-----------------------
a=-9
---------------
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