Firstly, if that's how this works -- rather than by allowing you to guess and check until things match up -- then I am very much misunderstanding it. Secondly, there's no way this thing is going to be as powerful as a CAS. Hell, from the description I seriously doubt it'll do so much as solve a system of linear equations for you, just let you explore the space until you find a solution.
One of us is misunderstanding something. What I'm imagining is, you adjust the value by dragging it, and then the CAS solves for the red value. There's no requirement for monotonicity or anything, if the CAS can solve for a unique red value to satisfy the equation, you're good.
