Question 1093733
<br>You don't need to be a slave to magic formulas that you might not understand.  Find the answer by logical reasoning.<br>
One endpoint is (-1,9); the midpoint is (-9,-10).<br>
Think of walking along this line segment.  You start at x=-1 and get to the midpoint at x = -9, a change of -8; you start at y=9 and get to the midpoint at y=-10, a change of -19.<br>
You have reached the halfway point in you journey by going -8 in the x direction and -19 in the y direction; you will reach the end of your journey (the other endpoint of the line segment) if you go another -8 in the x direction and another -19 in the y direction.<br>
-9 + (-8) = -17; this is the x coordinate of the other endpoint.<br>
-10+ (-19) = -29; this is the y coordinate of the other endpoint.<br>
The other endpoint of the segment is (-17,-29).