SOLUTION: I was given the a2=3 and a5=24. how to get the first term and the common difference?

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Question 978165: I was given the a2=3 and a5=24. how to get the first term and the common difference?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
From term at index 2 to term at index 5 is three times the common difference.
d=21%2F3=7.

a%5B1%5D=3-d
a%5B1%5D=3-7=-4