Answer:
-1/3
Step-by-step explanation:
To find slope intercept, it's (y2 - y1) / (x2 - x1). It can also be (y1 - y2) / (x1 - x2) as long as you're consistent.
Plugging the x and y values in using the first equation, you get (0 - 1) / (3 - 0) = -1/3.
