Hey Alison!
Your vision can come to life in three steps! I’ll present them separately, but know that they can actually be done together once you get the hang of it:
Step 1: Plot the points from an input
https://teacher.desmos.com/activitybuilder/custom/5ced88e21df0500c65cc7e5c#preview/c94cf9b8-eb76-4e00-9d9d-8f32d3d434dd
Use parseOrderedPair to take a coordinate pair written in an input and put it into the graph. You can also use a table for this step but because you will be aggregating student data later, this method is encouraged.
Step 2: Make two copies of each point in the graph
https://teacher.desmos.com/activitybuilder/custom/5ced88e21df0500c65cc7e5c#preview/3d2e3ba8-970e-4c69-9142-6161530b5f82
Display each point based on whether or not they satisfy the desired inequality (in this case x+y>5)
Step 3: Aggregate Student Data
https://teacher.desmos.com/activitybuilder/custom/5ced88e21df0500c65cc7e5c#preview/301a660b-a5f7-47e5-9641-a47fdf5d6fe5
Use the aggregate function to collect each of the numbers from the students’ screen into a single list. Plot that list just like you plotted points on screen 2 by using conditions to hide and show points.