Answer:
y = -3x +2
Explanation:
The y-intercept is at +2, so that is the value of the added constant (b).
The line goes down 3 units for each unit to the right, so the slope (m) is ...
... m = ∆y/∆x = -3/1 = -3
Then in the form ...
... y = mx + b
with m=-3 and b=2, your line's equation is ...
... y = -3x +2