# Correct point on graph unlocks hidden components

I would like to be able to hide the second note and the table on this slide until students have moved point P into place.

Is there a way to have a correctness check within the graph communicate with other components?

You can pull any numeric variable from a graph using the number source. Here is an example on slide 2: [Copy of] Coordinate Geometry â€˘ Activity Builder by Desmos

Amazing, Daniel. You saved me again. Hereâ€™s what I did with it Thank you so much.

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Me again with a related question on this slide.

Iâ€™m trying to get two components (marked HideNote and HideRight) to appear when C1, C2, and C3 equal 1. C1,C2, and C3 are within the Graph. Because I used a list to evaluate them, Iâ€™m not able to get them to be 1.

@Daniel_Wekselgreene any thoughts on how to correct this?

You can change `C_3={.... :1,0}` in the graph to be `C_3=total({.... :1,0})`, which will give a numeric value for C1/2/3 rather than a list. You can then compare `C_3` to 3 rather than 1 to see if it is correct.

One of the Daniels on here, I think @Daniel_Grubbs , always suggests that in situations like this you make 0 the â€ścorrectâ€ť value and 1 for incorrect - that way youâ€™re always checking for `C_3=0` for correctness, rather than having to adjust to 3 or 4 or however many terms in your list.

Yep - I made those changes here: [Copy of] Coordinate Geometry â€˘ Activity Builder by Desmos

I didnâ€™t edit the rest of the slide because I wasnâ€™t clear what everything should do.

Thanks, again! It worked.

@pirsquared I do like that! Though Iâ€™ve since had to conform for the purposes of collaboration!

Haha! You guys are funny.

It wasnâ€™t working that way, anyway, so I changed it back to C_1={â€¦ :1,0}. Hereâ€™s my final product. I know youâ€™re all busy, but Slide 8 might make you laugh.

Not sure if Iâ€™ll even use it, but I learned a lot making this activity. I appreciate all of your help. Thank you. @Daniel_Grubbs, you didnâ€™t specifically help on this one, but youâ€™ve helped me before, so thank you to you, too.

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