Answer:
slope = - 2
Explanation:
Calculate the slope m using the slope formula
m =

with (x₁, y₁ ) = (- 8, 4) and (x₂, y₂ ) = (- 1, - 10) ← 2 points on the green line
m =
=
= - 2
Repeat with (x₁, y₁ ) = (- 3, 0) and (x₂, y₂ ) = (0, - 6) ← 2 points on the blue line
m =
=
= - 2
Since the slopes are equal then the lines are parallel