A low-wattage radio station can be heard only within a certain distance from the station. On the graph below, the circular region represents that part of the city where the station can be heard, and the center of the circle represents the location of the station. Which equation represents the boundary for the region where the station can be heard?
A. (x-6)^2 + (y-1) ^2 = 16
B. (x+6)^2 + (y+1)^ 2 = 16
There are two other answer choices but I'm almost certain is either those 2. Also can you give me an explanation or steps on how you solved the answer? Thanks!