How do you want the coordinates shown to students - in the table you included, or on the graph?
Here’s an edited copy that has two draggable points with their coordinates shown on the graph: [Copy of] 2-20 Fit a Line (3 pages) • Activity Builder by Desmos
I changed the sketch on screen 2 into a graph so that students can drag. I also added in a dashed line connecting the points which you can turn off if you don’t need. You already had the graph hooked up include students’ input from screen 1, so I didn’t touch that I hope this helps!