I am trying to figure out how the coeffecients in the general second degree equation transform the function as they change through a range of values. I think that d and e are the proportion of x and y are horizontal and vertical shifts, but less sure about a, b, and c. Here is the equation as i am familiar with it ax^2 + bxy + cy^2 + dx + ey + f = 1 I'm having trouble finding good material online, maybe just don't know where to look. Also, i would like to find some free software similar to geometers sketchbook, particularly where i could create interactive graphs. i've seen some people have made that have sliders that allow you to change a value on the graph as see the change it causes. Anybody know of any? Thanks, all.