PDA

View Full Version : Homework on Coordinate Geometry


GDss
Oct 22, 2009, 11:33 AM
Hi guys. I'm currently doing my homework but I'm stuck on this question and I need help ASAP

" find K given that (-3,k) is 7 units away from (2,4)"
How do I solve this question. And which formula do I use
Thanks guys so much.
Xxxx

ebaines
Oct 22, 2009, 11:40 AM
The distance between two points on a coordinate grid can be found from Pythagorus:


d = \sqrt {(x_1 -x_2)^2 + (y_1 - y_2)^2 }


Here d = 7\text {, }(x_1,y_1) = (2,4)\text{, and }(x_2,y_2) = (-3, k). Use these values in the above equation and solve for \small y_2.

GDss
Oct 22, 2009, 11:45 AM
Thank you ebaines :)!!

ebaines
Oct 22, 2009, 11:51 AM
Your are welcome! Don't forget that there are two possible answers.