Answer:
See below.
Explanation:
Horizontal lines have the equation:
Where n is the value the horizontal line stays on.
Vertical lines have the equation:
Where n is the value the vertical line stays on.
For the two north-south lines, one of them stays on -5 and the other stays on 8. Therefore, the two vertical line equations are:
For the two east-west lines, one of them stays on -7 and the other stays on 4.
Therefore, the two horizontal line equations are: