Rejecting duplicate inputs for two correct answers

[Steve_Foster]

I’m making a review for students solving factored equations and there are two correct x= values. I am having trouble rejecting entering a correct input twice. I’d like to post a message saying they’ve already used that answer and unsubmit one of the duplicates (if it is a correct answer). This work is on Slide 5.

My sample code

[Daniel_Grubbs]

Maybe this recent thread will give you some ideas.

Systems of Equations (check correct in a Table)

I am trying to figure out how to do “isCorrect” in such a way that cell(1,2) is not the same equation as in cell(1,1). Here is my coding so far: #Correct response x+y=59685 or 5x+2.5y=270425 #creates lhs-rhs, so f(x,y)= x+y-59685 and g(x,y)=5x+2.5y-270425 f = parseEquation(this.cellContent(1,1)).differenceFunction(“x”,“y”) g = parseEquation(this.cellContent(1,2)).differenceFunction(“x”,“y”) #solutions should = 0 checkA = f.evaluateAt(59685,0)=0 and f.evaluateAt(0,59685)=0 checkB = f.eval…

[Steve_Foster]

Thank you for the quick reply. I’ve not worked with table inputs yet (very new to CL). I’ll look for some sample code. Can you or anyone point me to a sample of check correct in a table (one that checks AND shows the student “correct” or “not correct”)?