Which relationship has a zero slope?

Ineed with number 17 i don’t get it at alll

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30

Wrote and expression for the difference of p and 4