Answer:
B. -2
Step-by-step explanation:
Since the line is coming from the top left to the bottom right, you know the line is going to be negative.
If you take two points, so (0,1) and (1,-1), and use the formula y2-y1/x2-x1, after substitution you should get -1-1/1-0. If you simplify, the answer should be -2/1 or -2.