# Validation Challenge

**URL:** <https://cl.desmos.com/t/validation-challenge/5698>\
**Category:** Discussion\
**Created:** [May 29, 2024, 6:01pm UTC](https://cl.desmos.com/t/validation-challenge/5698 "2024-05-29T18:01:15Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![SchuylerAlschuler](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/schuyleralschuler/32/3852_2.png) [@SchuylerAlschuler](https://cl.desmos.com/u/SchuylerAlschuler)\
**Post date:** [May 29, 2024, 6:01pm UTC](https://cl.desmos.com/t/validation-challenge/5698/1 "2024-05-29T18:01:16Z")

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Here’s a little challenge from me and @SarahMW. How would you validate a student’s answer on [this screen](https://teacher.desmos.com/activitybuilder/custom/664e547d9f6281c137d53ee9)? Make a copy of the activity and share your strategies here!

While you work on the challenge, think about how you can honor student thinking even on a simple screen like this one.

 ![An activity screen. The prompt says, "Drag the points to graph a line through the points (1,1) and (4,5). Write the equation of the line." There is a graph with a line through two movable points on the left and a math input on the right.](https://canada1.discourse-cdn.com/flex031/uploads/desmos/original/2X/6/6b728b4d19b71a13f0b17c8fc0aa162484a96674.jpeg)

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**Author:** ![Daniel\_Wekselgreene](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_wekselgreene/32/1819_2.png) [@Daniel\_Wekselgreene](https://cl.desmos.com/u/Daniel_Wekselgreene)\
**Post date:** [May 30, 2024, 6:12am UTC](https://cl.desmos.com/t/validation-challenge/5698/2 "2024-05-30T06:12:32Z")

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Here is my initial take on this: [CL Day Prompt - Validating Feedback on a Line • Activity Builder by Desmos Classroom](https://teacher.desmos.com/activitybuilder/custom/66576e54af9410a3bd700868)

The idea is to validate their equation both in terms of the correct answer and in terms of the graphed line, assuming there is a mistake in the plotting of the points. I tried to use different colors and some animation to try and show these things, but I think it ended up feeling a little too visually busy.

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**Author:** ![chartma](https://avatars.discourse-cdn.com/v4/letter/c/7c8e57/32.png) [@chartma](https://cl.desmos.com/u/chartma)\
**Post date:** [June 18, 2024, 11:16pm UTC](https://cl.desmos.com/t/validation-challenge/5698/3 "2024-06-18T23:16:51Z")

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If I am expecting slope-intercept form, I might use this code in the CL:  
function(`f`): when equation.submitted simpleFunction(equation9.latex)  
otherwise simpleFunction(``)

I would then list f(x) in the graph editor and name the math response box “equation”. It would display a new line based on their equation after they click the Submit button.

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**Author:** ![ASmith](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/asmith/32/360_2.png) [@ASmith](https://cl.desmos.com/u/ASmith)\
**Post date:** [June 4, 2025, 1:05pm UTC](https://cl.desmos.com/t/validation-challenge/5698/4 "2025-06-04T13:05:49Z")

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It’s so pretty! And sometimes adding the extra feedback changes the repetition!

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**Author:** ![ASmith](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/asmith/32/360_2.png) [@ASmith](https://cl.desmos.com/u/ASmith)\
**Post date:** [June 4, 2025, 1:07pm UTC](https://cl.desmos.com/t/validation-challenge/5698/5 "2025-06-04T13:07:14Z")

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Will that check for slope intercept form or just that it is in y equals form? If they responded in y=m(x-x1)+y1 form, would the code you listed still mark as correct?