Find a Formula for an for the Arithmetic Sequence $a _ { 3 } = 8 , a _ { 7 } = 36$

Multiple Choice

Find a formula for an for the arithmetic sequence. $a _ { 3 } = 8 , a _ { 7 } = 36$

A) $a _ { n } = - 6 + 7 n$
B) $a _ { n } = 13 - 6 n$
C) $a _ { n } = 7 - 6 n$
D) $a _ { n } = - 6 ( 7 ) ^ { n }$
E) $a _ { n } = - 13 + 7 n$