SOLUTION: The second term of an arithmetic sequence is 18 and the 9th term is 46. Find the first term.

Question 822257: The second term of an arithmetic sequence is 18 and the 9th term is 46. Find the first term.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The second term of an arithmetic sequence is 18 and the 9th term is 46. Find the first term.
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Equations:
2nd term:: a + d = 18
9th term:: a +8d = 46
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Subtract and solve for "d"::
7d = 28
d = 4
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Solve for "a":
a + d = 18
a + 4 = 18
a = 14 (1st term)
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Cheers,
Stan H.
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