Does anyone know the common difference of -7,-9,-11?

I’m pretty sure that it’s 2 because your suppose to subtract the term from the term that follows it.

d= -2

Step-by-step explanation:

-7-2= -9

-9-2= -11

-11+2 = -9

-9+2= -7

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.