Final answer:
Chloe's house is located at the point (2, 9) on the coordinate grid.
Step-by-step explanation:
To find the position of Chloe's house, we need to find the midpoint between Jeff's house and Vicki's house. The x-coordinate of Chloe's house will be the same as the x-coordinate of Jeff's house, which is 2. The y-coordinate of Chloe's house will be the average of the y-coordinates of Jeff's house and Vicki's house, which is (6 + 12) / 2 = 9. Therefore, Chloe's house is located at the point (2, 9) on the coordinate grid.