SOLUTION: Given that for an AP seventh term=43 and second term=91,find the valves of a,d and n.

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Question 861348: Given that for an AP seventh term=43 and second term=91,find the valves of a,d and n.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
an = a + (n - 1)d
43 = a + 6d
91 = a + d
-48=5d
-48/5=d
91 = a -48/5
a = 503/5, d = -48/5
n is whatever you want it to be.