Solve for 2b+v=13 and b+v=8

b+v=8

b+v-v=8-v

b=8-v

2b+v=13

2(8-v)+v=13

(2)(8) (2)(-v)+v=13

16-2v+v=13

16-v=13

16-v-16=13-16

-v=-3

-v/-1=-3/-1

v=-3

b=8-v

b=8-(-3)=8+3=11