Current hosted at https://mathbuffet.party
this is based on the excellent tutorial by Ali Spittel, and uses the same technique to generate a slope equation from a drawn line.
Connecting a physical action to the resulting mathematical equation could be helpful for some learners who are more visual and like to "feel" the equations.
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It would be nice to eventually have functionality for quadratic equations, but will need time to work on that.
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Eventually, learners attempting to draw a line from an equation might be able to get feedback on how close their line is to the equation.