Find the Indicated Terms $a _ { 1 } = 10 , a _ { 2 } = 7$

Multiple Choice

Find the indicated terms.
-If the third and fourth terms of an arithmetic sequence are -7 and -10, what are the first and second terms?

A) $a _ { 1 } = 10 , a _ { 2 } = 7$
B) $a _ { 1 } = - 1 , a _ { 2 } = - 4$
C) $a _ { 1 } = - 4 , a _ { 2 } = - 1$
D) $a _ { 1 } = 7 , a _ { 2 } = 10$