Answer: B. No solution.
Explanation:
First, we will set one of the equations equal to a single variable by subtracting y from both sides.
x + y = -9 ➜ x = -y - 9
Next, we will substitute this into the second equation and see if we can solve it. As you can see, the y-variable canceled itself out. This means there are no solutions. The lines are parallel to each other, see attached.
-3x - 3y = 3
-3(-y - 9) - 3y = 3
3y - 27 - 3y = 3
-27 = 3