I do not understand this question

The graph of g(x) is a translation of y = which equation represents g(x)?

Ineed to know the answer to this algebra question.

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