If Darnell's house is at the origin of a coordinate plane, then we can represent the position of the cell phone tower as an ordered pair (x, y), where x is the horizontal distance from the origin (in blocks east or west), and y is the vertical distance from the origin (in blocks north or south).
We are given that the tower is 6 blocks west and 2 blocks north of Darnell's house, so we can write:
x = -6 (since it is 6 blocks west of the origin)
y = 2 (since it is 2 blocks north of the origin)
Therefore, the location of the tower as an ordered pair is (-6, 2).