Hi there.
I’m trying to check for correctness for a line in point-slope form. If the two lines are parallel, I would like for an icon to appear, but I can’t seem to make that happen. Any help is appreciated.
Hello! It looks like g(x,y) was set to the negative version of what is needed (differenceFunction sets f(x,y) to lhs - rhs of the student equation, which I frequently get flipped around). I made that change in the graphing calculator and the icon appears in the updated activity. I hope that helps!
Amazing, Ian. Thanks for your help with that. I have another question, if you don’t mind. How can I make it so that the icon appears after students press the Submit button?
Happy to help 
the same copy I shared before is updated again. I changed it so that the feedback icon on the graph and the smiley/X in the input box show up after students press Submit. Did you want both pieces of feedback delayed, or just the icon?
So great – and I learned something! Thank you so much 
In case it’s helpful/useful for you, I’m attaching the entire activity here.
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