SOLUTION: S = n/2[2a +(n - 1)d]. Solve for a. Not sure how to solve. Non-homework.

Question 1106609: S = n/2[2a +(n - 1)d].
Solve for a.
Not sure how to solve. Non-homework.

Answer by ikleyn(52776) (Show Source): You can put this solution on YOUR website!
.

Step 1.  Divide both sides by .   You will get    = 2a + (n-1)*d,   or    = 2a + (n-1)*d.    (1)


Step 2.  In (1),  subtract (n-1)*d from both sides.  You will get   2a =  - .                  (2)



Step 3.  In (2), divide both sides by 2 and get the   ANSWER   a =  - .

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