All the lines have a slope of -1, and clearly don't intercept due to different y-intercepts, so the lines are parallel.
How to find the slopes?
If a line passes through two points (x₁, y₁) and (x₂, y₂), then the slope is given by:
a = (y₂ - y₁)/(x₂ - x₁)
So let's use that for each line.
A) this line passes through (-2, 0) and (0, -2), the slope is:
a = (-2 - 0)/(0 + 2) = -2/2 = -1
B) this line passes through (-4, 0) and (0, -4) so:
a = (-4 - 0)/(0 + 4) = -1
C) finall, this line passes through (-3, -5) and (-5, -3), then:
a = (-3 + 5)/(-5 + 3) = -1
So the 3 lines have the same slope (and clearly different y-intercepts) so the 3 lines are parallel.