Question

The midpoint of a line segment is (-1, 4). The endpoints of the line segment are (3, y) and (-5, 10). What is the value of y?

Answer 1

-2

Explanation:

The midpoint is the average of the end point coordinates, so ...

4 = (y +10)/2 . . . . the y-coordinate is the average of the y-coordinates

8 = y +10 . . . . . . . multiply by 2

-2 = y . . . . . . . . . . subtract 10