The problem is:
Find an equation for the family of line tangent to the circle with the centre at the origin and radius 3.
I've been looking at this problem all day and can't for the life of me crack it! I would really appreciate some help or I won't sleep tonight!!
hmm they don't seem to look right do they....
the 0's are supposed to be subscripts - sorry!
(By they way, how do you make equations look acceptable on here?)
thanks for persevering with my question, Divideby0 - I really do appreciate your help.
cheers
L
You can use the LaTeX ('Lay-Tech') typesetting. There is a thread on how to use it here:
http://www.mathhelpforum.com/math-he...-tutorial.html
Hello, lindax!
I don't trust your textbook.
No one writes the equation of a line like that!
The equation of the circle is: .Find an equation for the family of line tangent to the circle
with the centre at the origin and radius 3.
Differentiate implicitly: .
The line through with slope .has the equation:
. . .
Since: .
. . the equation becomes: .
Hi Soroban
Thanks so much...I can see now why I could not work out how to get that answer - my calculus is very rusty after a 30 year break! (I'm working on improving it by making my way through this text - Anton, Bivens & Davis -Calculus 7ed.)
I think that given the context of the question, Divideby0's answer was more appropriate for this level.
Thank you both for your help.
Just another question while you are there, if I use LaTex notation for my equations on this forum, should I see it when I do a preview of the post or does it show up afterwards when the message has been submitted?
L