Asked by Anonymous

The 9th term of an arithmetic progression is three times the 5th term, find the relationship between the first term and common difference
Answered by Reiny
9th term = a+8d
5th term = a + 4d

given: 9th term = 3(5th term)
a + 8d = 3(a + 4d)
a + 8d = 3a + 12d
-2a = 4d
a = -2d, where a is the first term
Answered by Ebun
Do we need to solve for difference
(d)
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