# Can anybody Help with this activity

**URL:** <https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707>\
**Category:** Questions\
**Created:** [February 19, 2021, 1:40am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707 "2021-02-19T01:40:52Z")\
**Posts on this page:** 20\
**Page:** 1

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**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 19, 2021, 1:40am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/1 "2021-02-19T01:40:52Z")

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> **[Calculating in CL • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/602da403af60e43a97480ac4)**
>
> by Z. Kovacevic

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**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 19, 2021, 2:34am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/2 "2021-02-19T02:34:49Z")

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You’ll have to be more specific.

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 19, 2021, 1:16pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/3 "2021-02-19T13:16:06Z")

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I am trying to create an activity, and desmo’s team designed the activity that was sent to me to help me. On the second slide, in the first table, I am supposed to enter 2 points, the second table is to calculate the difference and the third slide is to use the calculations and check the parametric equations I don’t have experience with coding and I need help.

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**Author:** ![Susan\_Lauer](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/susan_lauer/32/1832_2.png) [@Susan\_Lauer](https://cl.desmos.com/u/Susan_Lauer)\
**Post date:** [February 19, 2021, 2:39pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/4 "2021-02-19T14:39:29Z")

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This one looks like an example of how to enter and check expressions and equations, and how to use info from previous screens.

When I begin to plan for an activity, I gather the equations and answers I’ll need, then figure out how I want the students to progress through the work, thinking about what info needs to be on which screens. I make the screens, then I work with the CL to handle the checks.

What do you have in mind for your activity? Please include more details about the problems you’re using and how you want the students to progress through the work.

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 19, 2021, 6:24pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/5 "2021-02-19T18:24:30Z")

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Students are asked to input coordinates of 3 points P1( x,y,z) P2( x,y,z) P3(x,y,z)  
and using those points to calculate the scalar equation of the plane Ax+By+Cz+D=0

 ![image.png](https://canada1.discourse-cdn.com/flex031/uploads/desmos/original/2X/f/f2303d3a9029390601d953dd944592d94cefc2b0.png)

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 19, 2021, 6:48pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/6 "2021-02-19T18:48:40Z")

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You’re not going to be able to access 3D coordinates. Your table would need to have separate cells for x, y, and z.

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 19, 2021, 7:12pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/7 "2021-02-19T19:12:20Z")

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have that

 ![image.png](https://canada1.discourse-cdn.com/flex031/uploads/desmos/original/2X/b/b632a0527599fd75793c076ea572f3a772a97174.png)

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 19, 2021, 7:40pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/8 "2021-02-19T19:40:59Z")

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Here’s how I’d handle all the [calculations in a graph](https://www.desmos.com/calculator/5uj2whhefn) (you can paste the link into an expression line in the graph to copy the whole thing).

You’ll want to replace the values in lists A, B, and C with variables (say a\_x, a\_y, a\_z, etc.), then define those in the graph CL. You’ll also need to define function f, from the student scalar equation

```auto
number(`a_x`): yourTableName.cellNumericValue(1,1)
number(`a_y`): yourTableName.cellNumericValue(1,2)
etc...
function(`f`): parseEquation(yourTableName.cellContent(row,column)).differenceFunction("x","y","z")

```

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 20, 2021, 12:21am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/9 "2021-02-20T00:21:09Z")

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would it be easier if I send you the actual activity that I am working on?

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 20, 2021, 1:24am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/10 "2021-02-20T01:24:21Z")

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It’s always more helpful to see what’s already done.

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 20, 2021, 1:37am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/11 "2021-02-20T01:37:47Z")

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[https://teacher.desmos.com/activitybuilder/custom/600c424a718797407e17e7e8?collections=5fbe6ebcf1ee710d79747e13](https://teacher.desmos.com/activitybuilder/custom/600c424a718797407e17e7e8?collections=5fbe6ebcf1ee710d79747e13)

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 22, 2021, 12:18am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/12 "2021-02-22T00:18:28Z")

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Honestly, I’m not experienced writing parametric and scalar equations. The calculations I did in the other was just after looking up how to write a scalar equation from 3 given points, so I’m not sure how to help you because I don’t really follow the use of s and t, and don’t have time at the moment to look into it.

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 22, 2021, 12:53am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/13 "2021-02-22T00:53:49Z")

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thank you for your time and consideration and honesty!

Stay safe, stay healthy!

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<div class="post-metadata">

**Author:** ![Susan\_Lauer](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/susan_lauer/32/1832_2.png) [@Susan\_Lauer](https://cl.desmos.com/u/Susan_Lauer)\
**Post date:** [February 22, 2021, 7:24pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/14 "2021-02-22T19:24:58Z")

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It looks like you’ve got everything calculating correctly, so which screen are you trying to fix?

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 22, 2021, 8:37pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/15 "2021-02-22T20:37:22Z")

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Thank you Susan

slide 8 Scalar equation to use is for slide 10. I think we need to use matrices.

I would like to improve on slides 10, 11,12 (slides with teacher’s move)

 ![image.jpg](https://canada1.discourse-cdn.com/flex031/uploads/desmos/original/2X/e/eb3466bd74daf75f075d16f3c556a53bde503331.jpeg)

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 22, 2021, 10:15pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/16 "2021-02-22T22:15:33Z")

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> [@Daniel\_Grubbs](#):
>
> Here’s how I’d handle all the [calculations in a graph](https://www.desmos.com/calculator/5uj2whhefn) (you can paste the link into an expression line in the graph to copy the whole thing).

I had those matrix calculations in the Equation folder of the link I posted before. You just need to use a hidden graph.

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 22, 2021, 10:58pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/17 "2021-02-22T22:58:05Z")

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thank you,

so when I paste the link, I am not sure how can I verify the equation do I need to write something in CL

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 23, 2021, 1:11am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/18 "2021-02-23T01:11:34Z")

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updated activity,  
I transferred the equations into a graph for calculations (slide 8) but I do not know how to check the equations  
[https://teacher.desmos.com/activitybuilder/custom/600c424a718797407e17e7e8](https://teacher.desmos.com/activitybuilder/custom/600c424a718797407e17e7e8)

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [February 23, 2021, 3:54am UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/19 "2021-02-23T03:54:33Z")

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I’m still not sure about the nomenclature for the vectors, so I couldn’t walk through it to check everything. You’ll have to test that. On slide 8, I’ve added CL in the graph (now “KEY”), table10, and table11.

> **[\[Copy of\] Vectors - ShoeBox Project • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/6034767ebd8eb40d56c03b1e)**
>
> by Daniel Grubbs

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<div class="post-metadata">

**Author:** ![kovacez](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/kovacez/32/5293_2.png) [@kovacez](https://cl.desmos.com/u/kovacez)\
**Post date:** [February 23, 2021, 3:46pm UTC](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707/20 "2021-02-23T15:46:49Z")

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thank you so much looks great, table 10 is not accepting the equation, It’s fine I can remove feedback

can you help me with slide 10? I would like to ask students to input 1/2 of the x value (depth of the box) for both points D and E, for y-value to use information from slide 9, and finally calculate the z-value using the scalar equation of the plane

and to calculate the vector equation DE

Slide 11 and 12

 ![image.jpg](https://canada1.discourse-cdn.com/flex031/uploads/desmos/original/2X/5/5fb0c1f553b650c9beca347173c0ff19c330bd09.jpeg)

[Next page](https://cl.desmos.com/t/can-anybody-help-with-this-activity/2707.md?page=2)