Question 1151624
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Regarding this magic formula for the distance from a given line to a given point in a coordinate plane,  see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Vectors/The-distance-from-a-point-to-a-straight-line-in-a-coordinate-plane.lesson>The distance from a point to a straight line in a coordinate plane</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/geometry/HOW-TO-calculate-the-distance-from-a-point-to-a-straight-line-in-a-coordinate-plane.lesson>HOW TO calculate the distance from a point to a straight line in a coordinate plane</A> 

in this site.


From these lessons, &nbsp;you can also learn on how to derive this magic formula &nbsp;(it is important to know it (!) ) 
and how to use it, &nbsp;looking into numerous examples.