Here is a great activity from NCSSM that gets students writing a system of differential equations and then estimating them using Euler's Method in a spreadsheet. [br][br]The applet uses GeoGebra's ability to solve simultaneous Ordinary Differential Equations (ODEs).

This applet runs MUCH better through the desktop GeoGebra app. To download this file (in .ggb format) [size=150][size=200][url=https://drive.google.com/file/d/1VyeF_3tkJ1SPtITJJz1b4lN0ROO_2LiY/view?usp=sharing]click here[/url].[/size][/size]