Hey Flashkit!!!

I am currently reading a book on Flash MX game design entitled "flash mx game design demystified" and on pg. 111 under the heading <b>Line-Line collision Detection</b> the following formula is presented:

y=m*x+b

m = slope of the line
b = y-intercept ( spot where the line intersects the y-axis )

can anyone tell me what this equation means and point me to some kind of web page that will explain this in comprehensive detail?

Thanx a lot.