What is the closed linear form for this sequence given a1 = -15 and an + 1 = an - 8?

Question

A) an = 7 - 8n
B) an = -7 + 8n
C) an = -7 - 8n
D) an = -15 - 8n
my best answer is C

Answer 1

well, a = -15 and d = -8

now use the formula for the general term of an AP.

Answer 2

is it B