Activity Builder: Format (x,y) student input based on a rule

I need some help with a Desmos activity I am envisioning. I want students to input an (x,y) coordinate then have it display as red or green based on whether it satisfies a hidden linear inequality that they are trying to discover. Is this possible?

Based on the twitter conversation, this is my best guess for what you want:

Using columnNumericValues to create the number lists and a condition in the graph to show the correct style. Let me know if this is not what you intended!