If you want the intersect of M and N, then:
M∩N = {4,7} (common part in M AND N)
Slope = 0
⇒ It is a horizontal like that cuts through the y-axis
At point (5, -8), y = -8
The equation of the line is y = -8
-----------------------------------------------
Answer: y = -8
-----------------------------------------------
The correct answer:
The corresponding segments BC and AD in the image are parallel