Cellular phone networks use towers to transmit calls to a circular area. On a grid of a province, the coordinates that correspond to the location of the towers and the radius each cover are as follows: Tower 1 is at (-5, -3) and covers a 9 km radius; Tower 2 is at (3,6) and covers a 4 km radius; and Tower 3 is at (12, -3) and covers a 6 km radius.
Solution:
Tower 1 is at (-5, -3)
and covers a 9 km radius
Equation is ( x -(-5))² + (y -(-3))² = 9²
=> (x + 5)² + (y + 3)² = 81
Tower 2 is at (3,6) and covers a 4 km radius
(x - 3)² + (y - 6)² = 16
Tower 3 is at (12, -3) and covers a 6 km radius.
(x - 12)² + (y + 3)² = 36
(12,2) - TOWER 3
(-6 , -7) , TOWER 1
(2 , 8) , TOWER 2
(1 , 3) - TOWER 1 and TOWER 2
