to find ur sets of numbers, u simply plug in any number for x and solve for y
-x - 3y = -6.....lets say x = 0
-3y = -6
y = -6/-3
y = 2......so one set of pints is (0,2)
-x - 3y = -6...lets say x = 3
-3 - 3y = -6
-3y = -6 + 3
-3y = -3
y = -3/-3
y = 1....so another set of points is (3,1)
-x - 3y = -6.....,ets say x = 6
-6 - 3y = -6
- 3y = -6 + 6
-3y = 0
y = 0....and another point is (6,0)
so some points on ur line are : (0,2), (3,1), (6,0)