The equation (x + 6)^2 + (y – 8)^2 = 81 models the position and range of the source of a radio signal. Describe the position of the source and the range of the signals.

Answer 1

The equation of a circle centred at (x0,y0) and radius r is given by
(x-x0)²+(y-y0)²=r^2.

The posted equation therefore represents a circle with radius=√81, centred at (-6,8).

Continue with interpreting the results to complete the answer.