# Point Collector

**URL:** <https://cl.desmos.com/t/point-collector/4931>\
**Category:** Questions\
**Created:** [May 27, 2023, 11:26am UTC](https://cl.desmos.com/t/point-collector/4931 "2023-05-27T11:26:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mr\_Rhodes](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/mr_rhodes/32/4086_2.png) [@Mr\_Rhodes](https://cl.desmos.com/u/Mr_Rhodes)\
**Post date:** [May 27, 2023, 11:26am UTC](https://cl.desmos.com/t/point-collector/4931/1 "2023-05-27T11:26:36Z")

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Hi!

I was playing the game “Point Collector” with my students to practice graphing two variable linear inequalities. I noticed that when a student excludes the “equal to” symbol when creating an inequality the graph displays a solid line (even through it is not collecting the points on the line). Is there a way to code this so that a dashed line shows up when they input \< or \>? Students are confused when we transition to other activities where we use dashed lines to represent excluded points on the boundary line. Thanks!

> **[point collector • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/6471e89848e619617fc571b5)**
>
> by Nick Rhodes

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**Author:** ![ianmcmeek](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/ianmcmeek/32/3966_2.png) [@ianmcmeek](https://cl.desmos.com/u/ianmcmeek)\
**Post date:** [May 27, 2023, 2:56pm UTC](https://cl.desmos.com/t/point-collector/4931/2 "2023-05-27T14:56:06Z")

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Hi! You can graph the boundary of an inequality by using `simpleFunction` with the `differenceFunction` for the inequality a student types in. Then you can have two copies of the boundary line, one solid and one dashed, that are toggled on and off using `isStrict`. Here is a copy of your activity with the changes added:

> **[\[Copy of\] point collector • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/6472122bbf51efe001144ea3)**
>
> by Ian M

I believe each screen is updated, but it’s worth double checking! I hope this helps.