Question

How do you solve this?

Answer 1

Easy, they both add up to 180 degrees. 
2a-9+5a+14=180 
7a+5=180
7a=175
a=25

Answer 2

A. 2a-9+5a+14=180
5a+5=180
5a=175
a=35

B. 119 degrees
C. 61 degrees