August 2014 – jped Maths

Problems with straight line graphs

Ellipse, stuck at origin, rotates

Take ellipse:

apply rotation to variables:

to make new equations:

then vary

to get rotating ellipse:

note that addition of an $xy$ term only to the original equation, under certain limitations of coefficients, means a rotation only.

hyrodium:

I made the drawing figure of 1/x with desmos graphing calculator. 😀

https://www.desmos.com/calculator/estpj0i9ou

http://hyrodium.tumblr.com/post/88457573594/how-to-draw-an-inverse-of-a-1-draw-a-unit

twocubes:

hyrodium:

Inspired by this twocubes’ post and asked to make a animation of it, I made a gif.

:3 this is pretty

(you could have @mentioned me or tagged me so that I could have noticed this earlier tho :V)