Someone please help me i asked 5 times already i really need help! shouldn't take long.. Identify which of the following has the smaller slope. What is the difference of the slopes?

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