Just click on the Green Flag snd watch the point, starting at (100, -100) spiral into its fixed point at (0, 0). Systems of equations of this type are known as 'dynamical systems'.
See my other fixed-point projects: A Fixed-point Attractor with/without Damping https://scratch.mit.edu/projects/11210506/ y= 0.5 x + 3 — a Simple Fixed-point attractor https://scratch.mit.edu/projects/302717792/