# Linear equation brain fart

**URL:** <https://forum.kirupa.com/t/linear-equation-brain-fart/319953>\
**Category:** Uncategorized\
**Created:** [March 9, 2011, 8:09pm UTC](https://forum.kirupa.com/t/linear-equation-brain-fart/319953 "2011-03-09T20:09:56Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![phastings](https://avatars.discourse-cdn.com/v4/letter/p/e9bcb4/32.png) [@phastings](https://forum.kirupa.com/u/phastings)\
**Post date:** [March 9, 2011, 8:09pm UTC](https://forum.kirupa.com/t/linear-equation-brain-fart/319953/1 "2011-03-09T20:09:56Z")

</div>

i’m having a mental block.

i know when my object is at y=620 another value should be A=0 and when it’s y=500 the value should be A=-70. what’s the formula for determining the value of A at various points of y?