Here is the graph of the information that we were given. Recall that the formula for the x-coordinate of the midpoint is: [math](x1+x2)/2[/math]. Here, we know x1 and x for the midpoint.
Use the segment tool to create another segment from point B that is the same length as AB. Move the other endpoint of this new segment so that AB and BC form a single straight line. What are the coordinates of the final endpoint?