Could someone please walk me through how to solve this?

Based on the figures as marked, /\rqs = —

What can you determine about the solutions of this system

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