1+4=5
2+5=7
5+7=12
3+6=9
12+9=21
I do not see21 up here so please cheek your question again or please change the 19 to a 21
Answer: B
Step-by-step explanation:
The line y=2 is solid and shaded above, so it represents .
This allows us to eliminate all the options except for B.