Nothice that this doesn't actually assign any of these values to x or y: These are simply a set of rules allowing you to assign these solutions to x and y.
To actually use these solutions, try the following:
This assigns the set of solutions "rules" to the name "systemSolutions"
Now, we can plug ALL of those solutions into an expression in x and y at the same time:
Or, you can get numerical values for these by: