Answer:
slope is -2
Explanation:
to find slope, it's usually the following

where (x1, y1) represents a point and (x2, y2) represents another
i'll label (0,1) as (x1, y1) and (3, -5) as (x2, y2)
so your equation starts to look like this

then simplify down to (-6)/3 = -2
hope that helps