First person gets marked map of a town is drawn on a coordinate grid where each unit represents a mile. the middle school is located at (3, –8). marcy’s house is at (3, 2) and henry’s house is at (8, –8). does marcy or henry live closer to the school? justify your answer and show any calculations used

Henry's House is closer to the middle school. As you can see in the graph; Henry's house is only a couple of miles away, while Marcy's house is very far from the house.

The point of Henry's house is closer to the point of the middle school than Marcy's house. One way to justify is through the distance formula.
The distance between the middle school and Marcy's house is 10, while the distance between the middle school and Henry's house is 5. 
Henry's house is exactly 1/2 the distance from Marcy's house to the middle school.