Answer: lines j and k are perpendicular
Explanation:
Let's find the equations of lines j and k

Line j: (8,2) (-2,-2)
x₁= 8 x₂=-2 y₁=2 y₂=-2

Multiply both parts of the equation by -4:

Line k: (-4,3) (-6,8)
x₁=-4 x₂=-6 y₁=3 y₂=8

Multiply both parts of the equation by 5:

Hence, lines j and k are perpendicular