Answer:
It is a.
Explanation:
Staring from the left we see that the line has a slope of 1 and a y intercept of (0,1). So the equation is y = x + 1. The filled circle at x = 2 shows that x = 2 is included in the domain so correct is y = x + 1 x ≤ 2.
Then this line is moved up 1 unit to give the equation y = x + 2 and the clear circle shows that this point x = 2 is not included in the domain so we have
y = x + 2 x > 2,