Youâ€™ll have to be more specific.

I am trying to create an activity, and desmoâ€™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 donâ€™t have experience with coding and I need help.

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 Iâ€™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 youâ€™re using and how you want the students to progress through the work.

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

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

Hereâ€™s how Iâ€™d handle all the calculations in a graph (you can paste the link into an expression line in the graph to copy the whole thing).

Youâ€™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. Youâ€™ll also need to define function f, from the student scalar equation

```
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")
```

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

Itâ€™s always more helpful to see whatâ€™s already done.

Honestly, Iâ€™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 Iâ€™m not sure how to help you because I donâ€™t really follow the use of s and t, and donâ€™t have time at the moment to look into it.

thank you for your time and consideration and honesty!

Stay safe, stay healthy!

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

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 teacherâ€™s move)

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

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

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

Iâ€™m still not sure about the nomenclature for the vectors, so I couldnâ€™t walk through it to check everything. Youâ€™ll have to test that. On slide 8, Iâ€™ve added CL in the graph (now â€śKEYâ€ť), table10, and table11.

thank you so much looks great, table 10 is not accepting the equation, Itâ€™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