SOLUTION: please help mesolve this equation .if,in an arithmatic sequence,the 4th term is 5and the 7th term is9,what is d?

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Question 1037353: please help mesolve this equation .if,in an arithmatic sequence,the 4th term is 5and the 7th term is9,what is d?
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.
a%5B4%5D = a%5B1%5D+%2B+3d = 5.
a%5B7%5D = a%5B1%5D+%2B+6d = 9.

Take the difference: 3d = 9-5 = 4.

Now calculate d.