SOLUTION: show that (an)=(7-3n) is arithmetic and state the common difference and first 4 terms?

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Question 1104279: show that (an)=(7-3n) is arithmetic and state the common difference and first 4 terms?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
%287-3%28k%2B1%29%29-%287-3k%29
%287-3k-3%29-%287-3k%29
%28-3k%2B4%29-7%2B3k
-3k%2B4-7%2B3k
-3
This -3 looks like a common difference for any k being a whole number. Probably works for integers.