y = mx + b
Put the given (x, y) points and known slope into the equation, and solve for b (the y-intercept):
-3 = 1 (- 2) +b
-3 = - 2 + b
b = -1
Now you can write out the second equation and line that is parallel to your equation. The slopes will be the same for parallel lines.
y = -x -1