1. The problem is to identify the original blue line and the perpendicular green line on the coordinate plane. 2. The blue line is a horizontal arrow along the x-axis near $y=-7$, so its equation is $y = -7$. 3. The green lines are vertical dotted lines at approximately $x=6$, extending from $y=4$ to $y=-8$. 4. Vertical lines have equations of the form $x = c$, so the green line's equation is $x = 6$. 5. Since the blue line is horizontal ($y = -7$) and the green line is vertical ($x = 6$), they are perpendicular. Final answer: - Original blue line: $y = -7$ - Perpendicular green line: $x = 6$